just had another foot thought today: Sometimes when I feel a foot or leg cramp (either one) coming on in spin class, it seems to be because I've forgotten to keep my heels down and am sort of "tip-toeing" on the pedals. I say "seems to be" because I can't know for sure, but it does often help to get my heels down again, and sometimes also wriggle my toes for a bit while I'm at it.