Anti-Gravity Treadmill Classes: How Sessions Work

Anti-Gravity Treadmill Classes: How Sessions Work

People searching for anti-gravity treadmill classes near me are usually after one of two things: a place they can book repeat running sessions on the machine, or supervision while they work back into running after an injury. In Sydney's Inner West, we run these as one-on-one physio-supervised sessions rather than group classes, for reasons that come down to how the machine is set up and how running load is prescribed.

Here is what the format actually involves.

How the treadmill works

The treadmill sits inside a sealed chamber that inflates around your lower body. You wear a pair of neoprene shorts with a zip skirt that seals into the chamber. Once you step in, the machine calibrates to your body weight, then air pressure lifts a set proportion of that weight off you.

Support is adjustable from roughly 20% of body weight up to 100%, in 1% increments, and it can be changed while you are running. Reducing body weight reduces the vertical ground reaction force through each leg roughly in proportion, so running at 60% body weight means each footstrike carries substantially less load than running on the road at the same pace.

Speed and incline work like a normal treadmill. The unusual part is that you can hold running speed while dropping load, which is why it gets used during return-to-running phases.

Why sessions are individual rather than group classes

Each person needs their own body weight percentage, their own duration, and their own progression rule. Someone six weeks post-ACL reconstruction and someone eight weeks into a tibial bone stress injury may both be running 10 minutes, but at different unweighting levels and with different reasons to stop.

Calibration also takes a couple of minutes per person, and the shorts are individually fitted. A rolling group format does not work well around that.

What we can do is book a block of sessions at a consistent time, typically two or three per week over four to eight weeks, so the treadmill work becomes a regular fixture rather than something you rebook each time.

What happens in a first session

The first booking runs about 45 minutes and starts off the machine. We take a history of the injury, any imaging and surgical details, current pain behaviour, and what you were running before things went wrong. Then a physical assessment: joint range, strength testing relevant to the injury, calf capacity, single-leg control, and a look at how you walk.

After that, you change into the shorts, step into the chamber and get calibrated. The first run is deliberately conservative. A common starting point is 5 to 10 minutes at 60 to 70% body weight at an easy pace, sometimes broken into intervals of running and walking.

We watch gait from the side and from behind, using the mirrors and camera, and note stance time symmetry, cadence and any compensations. Then we agree on what the next session looks like and what response would mean we hold at the current level.

Follow-up sessions are usually 30 minutes and combine treadmill time with the strength work that sits alongside it.

Who these sessions suit

Runners returning from bone stress injuries in the tibia, metatarsals or navicular, where load has to be reintroduced in small increments.

Post-surgical patients: ACL reconstruction, ankle or foot surgery, cartilage procedures, hip and knee replacements, once cleared by the surgeon.

Achilles and calf injuries, where the tissue tolerates the movement but not yet the full load.

People with knee or hip osteoarthritis who want to keep running or walking with less load through the joint.

Athletes managing training volume around a niggle, adding aerobic running minutes at reduced load while keeping some road running in the week.

When it is not appropriate

We screen for a few things before anyone gets in the chamber. Unhealed wounds or skin conditions on the lower body, recent abdominal or pelvic surgery, pregnancy, some cardiovascular and blood pressure conditions, and fractures that have not been cleared for weight bearing. If a surgeon or specialist has restricted your weight bearing, we need that clearance first.

The chamber also has a maximum user weight and height range, which we check when you book.

What to bring

Running shoes and normal running clothing. We supply the shorts. Bring any imaging reports, surgical notes or a GP referral if you have them, and a rough record of your recent training if you have been logging it.

If you are already seeing a physio elsewhere and want to add treadmill sessions to an existing plan, that works. We ask for the details of your current programme so the load we add fits around it rather than doubling up.

Booking

Sessions run at our Inner West clinic, within reach of Marrickville, Newtown, Leichhardt, Dulwich Hill and Ashfield. Blocks are usually planned around a specific goal, such as getting back to parkrun, a club season, or a distance event you have already entered, and reviewed every three or four weeks.

If you would like to talk through whether the treadmill fits your injury, book an assessment and we will work through it with you.