"but unless somebody has practice doing it" I've seen this with my own eyes, you need a rather high end physical therapy gym and it'll come with a physical the

"but unless somebody has practice doing it" I've seen this with my own eyes, you need a rather high end physical therapy gym and it'll come with a physical therapist. And the bill will be like $$$/hr because insurance is willing to pay that much, although the therapist only gets $/hr because there's a large enough oversupply of trained therapists, the remainder going into profit. I mostly saw kids using it. You can browbeat an adult in a wheelchair into "yeah you're gonna fall down and yeah its gonna hurt and the mats mean you won't die so toughen up and practice walking" but marine corps bootcamp motivational technique doesn't work well on little girls so I mostly saw them put wheelchair kids into the harness not adults or elderly. Some problems: 1) Did not look terribly comfortable WRT "couple hours experience". More comfortable than falling onto a concrete floor every couple minutes but its no couch in front of a TV. 2) The physical therapy gym is full of exercise junk which doesn't matter if you're a little kid (re-)learning to walk but is a big deal if you're rollerblading at 30 mph and hit a squat rack or a wall head on. Or run into another patient. 3) Speed is not an issue for little kids (re-)learning to walk but the rig may not be built for rollerblade speeds. 4) Moving takes energy and stamina as you mention so being unable to be hurt doesn't mean the knees can tolerate it.