Fall height decides the surfacing, and the surfacing decides the budget
On most outdoor fitness projects the largest single cost is not the equipment. It is what goes underneath it — and that figure is determined by one measurement taken off the drawing before anything is ordered.
It is also the item most often cut late in a project, which is how installations end up with equipment that cannot legitimately be opened.
Free height of fall
Free height of fall is the vertical distance from the highest point a user's body is supported to the surface below. Not the height of the structure — the height of the user.
That distinction matters on a pull-up bar. The bar may be at 2.3 m, but the body hangs below it, so the free height of fall is measured from where the feet or body actually are, not from the steel.
Above that threshold — the surface must be specified to the fall height
3000 mm — the usual maximum permitted free height of fall
Figures reflect common European practice. The applicable standard and the
exact thresholds depend on the jurisdiction and equipment type.
Outdoor fitness is not a playground
This is the part that causes the most confusion in specification, because the two look similar and sit under different standards.
Playground equipment for children is covered by its own standard family, written around unsupervised use by children of varying ages and an assumption that the user may not understand the risk.
Permanently installed outdoor fitness equipment has a separate standard, written around adult users who choose to use it and can read an instruction. The requirements differ in entrapment, in the expected user, and in some surfacing provisions.
Two practical consequences:
- Equipment certified for one is not automatically acceptable for the other. A fitness station installed inside a children's playground area may have to meet the playground standard instead.
- Mixed sites need the boundary drawn. If the fitness circuit is adjacent to play equipment and children will use it — they will — the specification has to decide which regime applies rather than leave it ambiguous.
What each surface buys
| Surface | Typical capability | Note |
|---|---|---|
| Grass / turf | up to roughly 1 m | fails under used stations |
| Bark mulch, 200 mm | around 2 m | needs topping up; displaces |
| Bark mulch, 300 mm | around 3 m | as above |
| Sand, 200–300 mm | 2–3 m | migrates; attracts animals |
| Rubber tiles | rated per tile thickness | highest cost, lowest maintenance |
| Wet pour | rated per build-up | seamless; repairs are visible |
Treat these as indicative. Loose fill performance is tested at a stated installed depth, and the number on the datasheet assumes that depth is maintained.
The maintenance trap in loose fill
Loose fill is specified because it is cheap at installation. Its performance depends entirely on depth, and depth is the thing that does not stay constant.
Under a used station, material displaces outward from the landing zone. Three months later the centre — the place someone would actually land — is at half the specified depth while the edges are mounded. The installation now has surfacing that tests fine at the perimeter and does not perform where it matters.
So the honest comparison is not tiles against mulch at installation. It is tiles against mulch plus a raking and topping-up regime for the life of the asset. Budgets that compare only the first number choose mulch and then discover the second.
If nobody is funded to maintain it, specify the surface that does not need maintaining.
Falling zones
The surfacing requirement is not just under the equipment. It extends around it, and the extent grows with fall height — a station with a 2 m fall height needs a correspondingly larger area treated, not a patch beneath the frame.
Which has a layout consequence worth catching early: two stations placed close together may have overlapping falling zones, and whether overlap is permitted depends on the equipment and the standard. Stations spaced for circuit training are exactly the case where this arises.
Decide spacing against falling zones before the drawing is issued, not after the groundworks quote comes back — this is the point where a layout that assumed clustered stations gets stretched out and stops working as a circuit at all. The spacing argument is in what belongs on an outdoor fitness trail.