The first time we saw Mark Jenkins jump rope at the speed of light we were convinced we had met superman. The guy jumps so fast you can barely see his feet leave the ground! New Yorker and Gulf War Veteran, he has become the go-to personal trainer for celebrities up and down the hip hop charts. He has worked with Mary J. Blige, P. Diddy, D'Angelo and Beyonce among others. But Mark is also determined to motivate today's youth to live healthier, active lives. He recently launched a Washington-D.C. based non-profit called IM Fit, dedicated to teaching youth about obesity prevention by motivating them to eat well and get fit.