I'm about as cheap as it gets, so while it was 110-115 degrees here in Phoenix over the summer and I was hardly ever riding, I would just do some sets of squats (bodyweight only, no bar) to keep some muscle workout going for my legs. I honestly have no idea if it helped or not, but it seemed like it did. If you're looking for something you can do for no money, with no touching your wrists, squats at least do something and I would think something is better than nothing.