I remember when I first saw these.
It was a video of a dad assisting his son with a bad case of cerebral palsy, kicking the ball around. Boy was ecstatic and started exerting some decent control over predictive head movements (looking for the ball), body turning and a little pairing of arm and leg for kick, all with dad behind as the assistant/support.
I worked with cerebral palsy kids 1/2 a lifetime ago for a full year, full time volunteer. [I wasn’t at college so it wasn’t for any credit. Rather it was the same cerebral palsy center *I* went to when I was preschool age and they helped me].
I had a tear in my eye watching it as it was such a simple concept yet I’d never seen it before. A chance to get out of the chair and bed, to be able to FACE FORWARD with your whole front of your body and gain a sense of “possibility”, enacting for yourself what you could only watch others do before.
I may have never used this but I’ll endorse it as a very good thing.