Quoting motherofboys:" I can't think of anything that would replace a ball, but I've done squats while holding onto a counter, ... [snip!] ... plus it adds in a little bit of an arm workout as my arms take some of my weight instead of it all being supported by my legs."
Quoting ----&&:" girl run to walmart! They are like $10...but honestly its done nothing for me haha, except take the pressure off my hips and back. But I'm still not progressing "