An in-ground trampoline is a full-size trampoline, frame, springs, mat and pad installed into a sunken pit so the mat sits flush with the surrounding lawn or patio. Because the mat is at ground level there is no ladder, no fall height and no frame to trip over, which makes it the safest and cleanest-looking layout for a backyard. A level yard is the ideal case: no retaining wall, no step-down pit wall, and a frame that sits true on the first attempt.
That last point is what separates this roundup. Most trampoline buying guides treat the ground as an afterthought, and buyers find out mid-project that their yard drops 18 inches across the pit footprint. We reviewed the six genuine sunken trampolines that exist today, compared their pit footprints, frame steel, mat area, weight limits and whether a safety enclosure ships in the box, then worked through what changes when the yard is level versus sloped.
Our team compared all six in-ground models side by side and read every owner review available on each listing. Review counts in this category are small, so we leaned on frame specification, warranty length and installation design rather than star averages alone. If you are still deciding between above-ground and sunken, our general trampoline roundup covers the full range first.
Top 3 Best In-Ground Trampolines for Level Yards (October 2026)
Avyna Premium In-Ground
- Hot-dip galvanized 11-gauge frame
- Vented mat with 70% more airflow
- Enclosure with lockable gate
- 1750 lb frame capacity
BERG Champion 14ft
- Enclosure included in the box
- TwinSpring gold springs
- Air Flow mat
- Low 20cm step-on threshold
ANYTHING SPORTS 10ft Rect
- Even rectangular spring tension
- Kit includes anchors and padding
- Suited to flips and training
- One-year parts warranty
The Avyna takes the top slot because it is the only model here that pairs a vented mat with a hot-dip galvanized frame and a layered safety package, and because its warranty is the longest in the group. The BERG is the pick if you want the enclosure in the box on day one and do not mind less excavation. The ANYTHING SPORTS rectangle is the value pick for anyone training flips on an even surface.
All Six In-Ground Trampolines Compared Side by Side in 2026
| Product | Specifications | Action |
|---|---|---|
| Avyna Premium In-Ground |
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 Capital Play Rectangular 11 x 8 |
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 Capital Play Round 12ft |
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| BERG Champion InGround 14ft |
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| ANYTHING SPORTS Rectangular 10ft |
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 ANYTHING SPORTS Round Flush Mount |
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Two things stand out in that table. First, only the Avyna and the BERG list an enclosure as part of the package, and both Capital Play models rely on vented pads plus a retaining wall rather than netting. Second, the published max user weights run from 220 pounds on the Capital Play rectangle to 1750 pounds of frame capacity on the Avyna, which is a much bigger spread than most buyers expect going into the project.
1. Avyna Premium In-Ground Trampoline – Best Overall for a Level Yard
Avyna Premium Round In-Ground Trampoline, 15, 14, 12 FT
Hot-dip galvanized 11-gauge alloy steel frame
96 springs
1750 lb frame capacity
Flush to grade, no ladder
Pros
- Vented mat moves more air and returns a noticeably higher bounce
- Frame is engineered for adult and family use
- Enclosure with lockable entrance plus UV pad over fully covered springs
- Longest warranty coverage in the group
Cons
- Build is a multi-day job for one person
- Frame is very heavy so several adults are needed to position it
- Replacement pad cost adds up after the first year
Avyna designs these in the Netherlands and builds the frame from hot-dip galvanized 11-gauge high-tensile steel, which is why the frame is specified at 1750 pounds of capacity. That number is a structural rating rather than a single-user limit, but it tells you the steel is in a different class from the lighter kits further down this list.
The Air X-TREM vented jump mat is the part owners mention first. It moves up to 70% more airflow than a standard mat, and the practical effect is a lighter, higher response that does not drag the way a heavy woven mat does. With 96 springs and a galvanized frame, this is the model I would put in a yard where adults jump alongside children.
Installation is the honest downside. Owners report close to five days of solo build time for this kit, and the frame is heavy enough that positioning it into the pit needs several adults rather than one. On a genuinely level yard the frame will sit true once it is in place, which saves a lot of the wrestling that crooked installations create.
Safety is handled in layers here: a weather-treated enclosure with a lockable entrance, a thick UV-protected foam pad, and springs that are fully covered. The model is offered in round and rectangular formats including 14ft round, 15ft round, a 15 x 15 square and a 12 x 18 rectangle, so you can match the shape to the yard instead of the other way round.
What the enclosure and pad setup means for a young family
Because the enclosure and the covered springs both come standard, you are not adding a second safety bill after the pit is dug. The lockable entrance matters in a shared-yard situation, and the UV-protected pad is the difference between a pad that lasts several seasons and one that crumbles in full sun. A minority of reviews do report the pad degrading quickly under heavy toddler use, so treat the first-year pad as a wear item rather than a permanent part.
Warranty coverage is the strongest here: lifetime on the frame, 10 years on the springs and 3 years on the pad and mat. Pad and mat are the components most likely to need replacing, so that third term is where the value of the longer coverage really shows.
What to plan for before the delivery arrives
Budget the excavation as a separate project. The unit itself is only part of the cost, and on a level yard the pit still needs to be dug, the base prepared and the frame set square before the surround is finished. Reviewers repeatedly note that the kit itself is the smallest line in the project once the yard work is counted.
Also plan the delivery route. At 235 pounds for the listed unit, and considerably more once the mat, springs and enclosure are packed, this is a freight-scale shipment rather than a parcel. Check that the frame can reach the pit on the day of arrival before you have the lawn open.
2. Capital Play Inground Rectangular 11 x 8 – Best for Small Yards
Capital Play Inground Trampoline 11ft x 8ft Rectangle | High Jump Trampoline Unique Airflow Vented Pads | Heavy Duty Commercial Grade | Long Warranty | Enclosure Available. (Green Pads)
Rectangular 11 x 8 ft jump surface
80 springs
2mm double-dip galvanized frame
220 lb max user weight
Pros
- Only in-ground brand using a double frame system
- Includes a retaining wall that cuts soil disposal
- Vented TDU pads improve airflow and response
- Compact footprint suits tight lots
Cons
- Lowest max user weight in the group at 220 lb
- Only 4 reviews so long-term feedback is thin
- Material gauge is lighter than some competing in-ground frames
This is the model to look at when your yard is level but short on depth. An 11 by 8 foot rectangle uses less width than a 12ft round unit and less length than a 14ft round, which matters when the pit has to sit between a fence, a patio edge and a planting bed. The rectangular geometry also gives even spring tension across the whole jumping area rather than the softer corners a round frame produces.
Capital Play is the only in-ground brand in this group using a double frame system, with 2mm thick double-dip galvanized steel at 42mm diameter across 275gsm material. That double-wall construction is the reason owners describe the frame as noticeably rigid in the pit, and rigidity is what keeps the mat plane flat once the surround is finished.
It is also the only kit here that includes a retaining wall as standard. The wall defines the pit edge, which means far less soil has to be carted away and you finish with a clean, straight lip around the trampoline. On a level yard that is a meaningful time saving during the dig.
Where the 11 x 8 rectangle works better than a round
Rectangular surfaces suit straight-line movement, flips, gymnastics drills and cardio work because the jumper is not constantly being steered back toward a centre point. If your family wants to practise tricks rather than just bounce, the even tension across the full mat is the deciding factor, and it is a compact rectangle with a proper galvanized frame at a lower entry point than the premium kits.
The TDU vented pads are worth noting too. Venting lets air move through the pad area, which keeps the spring bed responsive instead of cooking in sun. Buyers comparing this to the premium models usually point to pad airflow first when explaining the bounce difference.
Where it falls short for heavier jumpers
The 220 pound maximum user weight is the lowest figure here, and it is the one specification that should decide this for you. Two adults on the mat at once is outside what that rating describes, and the pads and springs are specified for a lighter duty cycle than the Avyna or the BERG.
Owner feedback is also thin, with only 4 reviews behind the listing, and one of those questions how much steel actually ships relative to other in-ground kits. A 3-star critique like that is worth taking seriously, so if frame mass is your top concern, physically handle the frame before you commit to the dig.
3. Capital Play Round 12ft – Best for Compact Round Pits
CAPITAL PLAY Inground Trampoline Kit 12ft Round | Kids & Adult | Extreme Jumps | Vented Safety Pads | Super Performance, Commercial Grade, Long Warranty. Enclosure, Accessories & Spares. (Green Pads)
Round 12ft jump surface
96 springs
264 lb max user weight
Bowl-shaped retaining wall included
Pros
- Bowl-shaped wall cuts excavation and soil disposal
- 96 springs for a responsive round bed
- Vented TDU padding improves airflow
- Flush install removes the ladder fall risk
Cons
- Only 1 review
- so durability feedback is almost absent
- 264 lb limit is below several competing models
- Enclosure and nets are extra purchases
The round 12ft is the same frame family as the Capital Play rectangle, sized for buyers who prefer the geometry of a circle. Round beds naturally push jumpers back toward the centre, which several owners describe as a safer, more self-correcting surface for younger children than a rectangle, where a missed landing puts you near the edge.
The defining feature is the bowl-shaped design with a built-in retaining wall. Instead of a vertical pit edge, the frame sits in a formed bowl, and the wall does the soil-retaining work. That means less digging and far less spoil to remove, which is the single biggest reason people choose Capital Play over the premium European kits.
At 96 springs with 264 pounds of rated user weight, this sits in the middle of the group for capacity. Round options run at 8ft, 10ft, 12ft and 14ft, and the rectangular range runs 10 x 6, 11 x 8, 14 x 10 and 17 x 10, so the same brand covers a small urban pit or a long training surface if your yard allows it.
How the bowl wall changes the digging job
On a level yard, the bowl shape means you are forming a shallow dish rather than cutting a square hole with vertical sides. The shape self-supports far better in soil, and because the wall is part of the kit you are not improvising timber or blockwork to hold the edges back. Owners consistently rate ease of installation as the top reason for choosing this brand.
The trade-off is that you inherit the brand’s own geometry. There is no way to convert the bowl into a vertical-walled pit later, so decide on the bowl before you break ground, not after. If your ground is heavy clay, a formed bowl is a considerable advantage over a vertical pit because the sidewalls are doing less retaining work.
Where the evidence runs out
There is a single 5-star review behind this listing, and while it is glowing, one review tells you very little about how a galvanized frame holds up over a decade in a wet pit. Treat the star rating as a first impression rather than a track record, and weight the frame specification and the double-dip galvanising instead.
Enclosures and nets are accessories rather than standard equipment here, so budget for the net if children will be jumping unsupervised. Our enclosure roundup covers the netting options worth pairing with a pit like this.
4. BERG Champion InGround 14ft – Most Versatile With Enclosure
BERG Champion InGround 14ft Trampoline with Safety Net, Trampoline for Kids, High Performance & Safety Features, Jump Higher with Airflow
14ft round frame with safety net enclosure
96 TwinSpring gold springs
330 lb max user weight
20cm low step-on threshold
Pros
- Enclosure is included in the box
- Air Flow mat and TwinSpring springs give a high bounce
- Only a low 20cm threshold
- so young children step on safely
- 10-year warranty plus 3 extra years on registration
Cons
- Nets tear and replacements are hard to source
- Replacement jump mat lead times are very long
- 394 lb frame is heavy to position in the pit
- Drilling beneath the frame is part of installation
The BERG is the only model in this roundup where a safety net enclosure is part of the package rather than an add-on, and that single fact changes the install calculation for a family with young children. Nothing else needs to be ordered after the kit arrives, and the net is a vertical barrier that sits above ground around the whole pit.
Bounce is the other draw. The Air Flow jump mat is specified at 50% more breathability than a standard mat, reducing drag so jumpers travel higher, and it is paired with 96 TwinSpring gold springs. Owners repeatedly describe the bounce as excellent, and the frame itself is widely praised as beautifully built.
Unlike a fully flush in-ground unit, the Champion sits on a low 20cm threshold, so it needs far less excavation than the other models here. That is a real advantage on a level yard where the soil is dense or roots are close to the surface, because every inch you do not dig is a day you do not spend.
Why the low threshold changes the install plan
A shallow threshold means you are not cutting a deep pit, which reduces spoil, reduces the risk of hitting bedrock and shortens the timeline considerably. It also means the trampoline reads more like a low platform than a true sunken pit, so if you chose this model purely for the invisible look, note that the frame itself stays partly above grade.
Installation still involves work. A hole has to be drilled under the trampoline during fitting, and the frame arrives as a freight-scale load rather than a parcel. That is not a problem, but it does mean your dig day and the arrival of the frame need to be coordinated with the pit open and ready.
Where the after-sales support is the weak point
This is the reason the rating sits just below 4.0 despite strong build quality. Several reviewers report torn nets, and replacement nets are genuinely difficult to source in this market. Others report multi-year waits for a replacement jump mat, which in practice can end the usable life of the trampoline even when the frame is fine.
So the BERG is a good buy if you accept that the frame will outlast the soft goods and you have a plan for mat replacement. It is a poor buy if you want a single purchase that never needs a part again. Check the parts channel for your region before the pit goes in, not after.
5. ANYTHING SPORTS Rectangular In-Ground 10ft – Best Value
Rectangular In-Ground Trampoline – Heavy-Duty Flush-to-Ground Outdoor Jumping Mat, Safety Padding & Easy Install Kit | Ideal for Kids, Families & Athletes | 7×10 Without Enclosure
Rectangular 10ft in-ground unit
Frame, springs, padding and anchors included
50 kg listed weight
One-year no-questions warranty
Pros
- Even spring tension across the whole jumping surface
- Rectangular format suits flips
- tricks and cardio training
- Anchors come in the box so the kit is complete
- Strong value among the in-ground options here
Cons
- Only a one-year parts warranty
- 50 kg listed weight is light for a premium pit
- Some variants come without an enclosure
This rectangular kit is the value entry point into in-ground jumping. The frame, springs, jump mat, protective perimeter padding and ground anchors are all in the box, and 68% of the 13 reviews are five-star, with owners citing the even rectangular bounce and the straightforward flush installation.
Shape is the reason to choose it. A rectangular mat gives even, controlled spring tension across the whole surface with no soft corners, which makes it the right tool for flips, trick practice, gymnastics drills and cardio work. If your family treats the trampoline as training equipment rather than a play bounce, that is worth more than a higher star average.
Variants are listed as 10 x 17 with enclosure and 7 x 10 without, so the same family covers both a serious training surface and a compact yard unit. Pay attention to which variant you select, because the presence or absence of the enclosure changes both the cost and the safety picture.
What the complete hardware kit actually saves you
Ground anchors shipping in the box is not a small detail for an in-ground unit. Reviewers describe shifting frames as one of the recurring complaints with sunken trampolines, and having the anchors supplied means you are not improvising fixings on installation day or relying on the frame to stay put on friction alone.
The flush-to-ground result also removes the ladder entirely, which removes the fall risk that a ladder introduces. On a level yard the surround can be finished right up to the frame lip, so the whole thing reads as a feature in the garden rather than a piece of equipment sitting on top of it.
Where the cost savings show up later
The warranty is 12 months, no questions asked, which is far shorter than the 10-year frame coverage on the Avyna and the 10-year frame warranty on the Capital Play kits. On a galvanized in-ground frame that is intended to sit in soil for a decade, that gap is the main compromise you are making to keep the entry cost down.
Frame weight is the second concern. The listed 50 kg is much lighter than the premium in-ground frames, so on softer ground you may need to build up support around the pit edges rather than relying on the frame to bridge the span. The few critical reviews on this listing relate to variant fit and delivery rather than the product itself, which is normal for this tier.
6. ANYTHING SPORTS Round In-Ground Flush Mount – Best for Easy Access
ANYTHING SPORTS Premium Round In-Ground Trampoline, 12FT and 14FT Diameters (14 FT Without Enclosure)
Flush-mounted round unit with galvanized frame
UV-resistant jump mat
50 kg listed weight
Ground anchors included
Pros
- Flush mount means no ladder to climb on or off
- Round shape guides jumpers toward the centre
- Quiet in use because the spring cover muffles spring noise
- Stable with no sway once properly installed
Cons
- Supplied springs can feel soft at first
- Variants come with or without an enclosure
- 50 kg listed weight is light for a premium pit
This is the round counterpart to the rectangular kit, and it is built around a genuinely flush mount: the mat sits level with the lawn, so there is no ladder and no step up. Owners call it the easiest of the round options to get on and off, which is the deciding factor for toddlers and for anyone with a bad knee or a bad back.
Circular geometry also has a safety argument. A round surface naturally directs a jumper who lands off-centre back toward the middle rather than toward an edge, and several owners in the reviews describe that as the reason the shape suits younger children. The mat itself is UV-resistant with thick perimeter padding, which matters in a pit that sits in direct sun.
Variants are listed as 12ft with enclosure and 14ft without, so check the box contents carefully before you commit. A flush pit with no net is a different proposition from the same pit with one, and it is the single most common surprise buyers in this category report.
How it behaves in daily family use
Owners consistently mention the low, clean-looking installation and the durability once it is properly set, often comparing it favourably against cheap above-ground models. The spring cover muffles the spring noise, which matters more than it sounds in a yard next to a house because a noisy mat gets jumped on less.
Stability is the other repeat comment: no sway and no excessive give once the pit is prepared. That is a function of installation rather than the product, so follow the ground anchors and soil preparation in the kit rather than assuming the frame will settle itself.
What to fix before the first session
The most common product criticism across the reviews is that the supplied springs can feel soft, making the mat hard to get a responsive bounce from until the springs are replaced. Budget for a spring upgrade at the outset, or accept a softer first season.
Frame weight is the same caveat as the rectangular version, at a listed 50 kg. That is light for a premium in-ground pit, so if your soil is soft you may need extra support at the edges. The few critical reviews on this listing concern a delivery failure rather than build quality.
How to Measure Your Yard and Size the In-Ground Trampoline Pit
Measure the whole area, not just the trampoline. The pit needs clearance around the frame for the surround to be finished, and if an enclosure is going in, the net posts need room outside the frame line as well. Mark the footprint with stakes and hose, then walk the outline before you commit to a size.
Check flatness across that footprint rather than at a single point. Run a straightedge over the staked area or pour water on bare ground and watch where it collects, because a low spot inside the footprint is what forces a frame to sit twisted. On a level yard this check takes ten minutes and saves a reinstall.
Confirm the delivery path and the pit depth against the model dimensions before the dig. The round models in this roundup list footprints from about 100 by 100 inches up to 165 by 120 inches, and the rectangle runs 120 by 84 inches, so a small yard rules some of them out immediately.
Level Yard vs Sloped Yard: What Actually Changes
On a level yard, the pit walls can be cut close to vertical, the frame sits on a level base, and the surround butts straight up against the frame lip. That is the cheapest and fastest version of this project, and it is the case every product in this roundup was designed for.
On a sloped yard, the falling side of the pit has to be retained or filled, which means either a retaining wall or an imported fill on the high side. The excavation gets deeper, the spoil volume rises, and the finish has to be graded to meet the frame rather than the lawn.
There is a middle path worth knowing about. On a gentle slope, levelling blocks under an above-ground frame can avoid a full excavation entirely, which is a different project from a sunken pit but sometimes the right call when the pitch is small. If the fall across the footprint is more than a few inches, a proper pit with a retained edge is the safer answer.
Owners on r/Trampoline report that in-ground units can work on a sloped garden when excavation and drainage are planned first, but the ones that were rushed tend to be the ones that shifted. Plan the water before you plan the frame, because that is the step that cannot be retrofitted cheaply.
Drainage, Winterization and Wind Anchoring for Your In-Ground Trampoline
Water in the pit is the most common long-term complaint. A gravel drainage layer under the frame lets water move away from the mat instead of sitting against the steel, and without it standing water is what causes rust on the frame and deterioration in the mat edges. This is the step most often skipped and the most expensive to fix later.
Winterizing is mostly about removing water and keeping the mat uncovered but ventilated. A pit that holds water and freezes will lift the mat, and a tight-fitting cover traps condensation against the jump surface, so a breathable cover or leaving the mat open is generally better than sealing the pit shut.
Anchoring stops both shifting and the blow-away scenario. Use the supplied ground anchors where the kit includes them, fix the frame into the surrounding soil rather than relying on its own weight, and treat any heavy wind event as a reason to take the mat cover off rather than leave it flying. Owners describe anchored in-ground units as stable; unanchored ones are where shifting complaints come from.
Buying Guide: Enclosure, Weight Limit, Frame and Bounce
Decide on the enclosure before anything else, because it changes the budget more than the frame choice. In this roundup the BERG and the Avyna include an enclosure, while both Capital Play models and the ANYTHING SPORTS variants treat nets as an accessory. Buyers who discover the net is extra after the pit is finished describe it as the biggest frustration in the category.
Match the max user weight to who actually jumps. The published figures run from 220 pounds on the Capital Play rectangle, through 264 pounds on the Capital Play round and 330 pounds on the BERG, to a 1750 pound structural capacity on the Avyna frame. If two adults will be on the mat, treat the lower two figures as a reason to look elsewhere.
Frame material is the durability question, and galvanising is the detail that matters. Every serious option here uses galvanized steel, with the premium kits specifying double-dip or hot-dip process at 2mm thickness. The lighter kits list roughly 50 kg, which is fine on firm ground and a problem on soft soil.
Bounce comes from three things: mat venting, spring count and mat area. Vented mats like the Air X-TREM and the Air Flow mats move more air and reduce drag, and more springs across a larger surface gives a flatter, more predictable bed. Shape matters too, with rectangles giving even tension for tricks and rounds guiding jumpers back to the centre.
Finally, weigh installation cost honestly. The kit is one line in the project, and excavation, base preparation, drainage, delivery and labour all sit on top of it. Owner discussions consistently treat the kit cost as the smallest part of the total, so build the full number before you commit.
Who Should Not Buy an In-Ground Trampoline
Skip it if the ground is mostly bedrock or dense clay. One owner reported a pool project that took seven to eight days because of bedrock, and an in-ground pit is a larger dig than a pool. If a test dig does not go down two feet cleanly, get a quote for professional excavation before ordering.
Skip it if you rent, or if your homeowners association restricts buried structures. A sunken trampoline is a permanent excavation, and reinstating a lawn afterwards is not a weekend job.
Also skip it if the yard slopes more than a gentle fall across the footprint and you are not prepared to retain the uphill edge. Once a retaining structure is involved, the project stops being a weekend dig, and that is where most disappointed buyers end up.
Frequently Asked Questions
Can you just put a trampoline in the ground?
Not quite. An above-ground trampoline cannot simply be dropped into a hole, because most are not built to sit below grade and the legs have nowhere to sit. In-ground trampolines are purpose-built kits with a flush frame, a surrounding lip and a lower profile, and they are installed into a pit dug to the manufacturer’s depth with a prepared base.
How deep does an in ground trampoline pit need to be?
For a fully flush unit, dig to roughly 12 to 18 inches deeper than the frame height so the frame can sit level and the surround can be finished up to the lip. Lower-profile models such as the BERG Champion sit on a 20cm threshold and need far less excavation. Always follow the depth in the manual for the specific kit.
Do in-ground trampolines need an enclosure?
A flush in-ground trampoline has almost no fall height because the mat sits at grade, so many owners run without a net and rely on covered springs and padding. For younger children, a net is still worth adding. In this roundup the BERG Champion and the Avyna include an enclosure, while both Capital Play models and the ANYTHING SPORTS variants sell nets as accessories.
Can a 400 lb person jump on a trampoline?
It depends entirely on the published max user weight, not on the frame. The listed limits in this roundup run from 220 pounds on the Capital Play rectangle to 264 pounds on the Capital Play round and 330 pounds on the BERG. A 400 lb jumper is outside all of those ratings, so check the specification and use a rebounder or fitness trampoline rated for that load instead.
How do you stop an in-ground trampoline from shifting or blowing away?
Anchor the frame into the surrounding soil rather than relying on its own weight, and use the ground anchors supplied with the kit where they are included. Bed the frame on a firm, level, well-drained base so it does not settle unevenly. In high winds, remove the mat cover rather than leaving fabric attached to the frame.
Conclusion: The Best In Ground Trampolines for Level Yards
For most level yards, the Avyna Premium is the one to build around, with a hot-dip galvanized 11-gauge frame, a vented mat that returns a genuinely high bounce, and the strongest warranty coverage in the group. It costs the most time to assemble, so plan the dig around that rather than discovering it on the first afternoon.
If the enclosure in the box matters more than anything else, the BERG Champion 14ft is the pick, and its 20cm threshold also saves excavation on harder ground. For a small or awkward yard, the Capital Play rectangle uses the least space and includes a retaining wall, and for training work on a budget, the ANYTHING SPORTS rectangular kit is hard to argue with once you factor in that anchors and padding are included.
Whichever model you settle on, the yard work decides whether the project ends well. Measure the whole footprint, check the fall across it, and build drainage into the base before the frame arrives. Those three steps are what separate a clean, level, flush installation from a frame that sits crooked in a wet pit. For more background on the wider category, start with our full trampoline buying guide, then come back to the pit maths.