I did find a YouTube of it, I could watch it but I have no sound. I can certainly see it is a very demanding exercise but I suspect it would not be the best solution for anyone who has joint problems from a degenerative condition, like me. On the best days I can't do extremely deep squats as a repetative exercise, my knees fail long, long before my muscles have even come close to being fully worked (also why I don't do lunges). I've considered a weighted leg machine before, but it's always about the $$$.
Ideally, I need something that will allow me to use my quads without putting excessive stress on my knees or lumbar region. One of the reasons I can't go as heavy as I'd like in deads is my lower back fails once I hit the 200s
Getting old sucks ... getting old with bad genetics
REALLY sucks.