Hey Dorine. I have been doing these with my Jungle Gym XT attatched to the bar. My ankle has been fractured for a couple of months now and can only support a small amount of weight so I only use that leg if the the bar reaches the safety arm on my rack, otherwise its just barely touching the ground. If you have some straps (TRX or whatever), you should try it. Feels kinda like a free moving power rack but without the lateral stability. Can’t wait till I can switch out legs, I think this could be a great exercise to build my injured leg back up… but not until I get some ankle strength.