So I was in the gym right now, and I got a cramp in my foot.
(One of the amusing things about this whole barefoot movement is getting cramps in your feet, btw.)
This cramp was in the muscle that pulls your big toe away from all the other toes. You know, that muscle that you NEVER use in shoes? I looked down at the big toe being pulled away from the other four toes and I was surprised. I didn't even know that it could flex in that direction!
Heck, I didn't even know I had a muscle that could DO that!