A few years ago, I took karate in college and the instructor walked on our stomachs while we did floor exercises. The guy was kind of big (maybe 200 pounds), but I was surprised that it really didn't hurt. I was just wondering has anyone else ever had someone step on them and not really feel much pain, or have you done this to someone and had them not feel much pain? I myself don't really see the purpose of this exercise, but if I know it is used in a lot of karate classes, and I think usually they should have a woman performing the technique to prevent injuries. thanks for your thoughts.