My feet cramp up quite a bit-- especially with the cardio dvds. Jillian talked about foot pain/cramping on a recent podcast. She said it could be a number of things: the wrong shoes, dehydration, not enough potassium, etc. I can't remember everything she said, but check out the Jillian Michaels Show podcast-- she gives a lot of great advice.

Seems strange, but have you tried working out without shoes? I had a lot of pain in my feet when I did cross fit, elliptical and other things and kept taking my shoes off. I now have vibrams, ugly shoes, but works for me.

Interesting - I actually only do the DVDs barefoot. Not so great with the resistance band part, but otherwise, it's a nice switch. I do a lot of cardio outside of the DVDs, in which I am wearing shoes, so this is nice. PLUS, I do these in the morning before starting the day, and barefoot is just easier.