. >> announcer: chalene johnson has revolutionized the fitness industry by turning her lifelong love for health and fitness into a phenomenal success story. she's a new york times best-selling author, lifestyle entrepreneur with millions of online followers, and has sold millions of best-selling fitness dvds. >> yeah, i've been doing this a long time. and with that experience comes knowledge, personal knowledge. i know you -- we don't have to punish our bodies to have an amazing body. molly, you're in my shot. that's why piyo's my favorite workout i've ever created. the workouts are shorter, you don't have to jump around, there's no equipment, and you can do it in the comfort and privacy of your own home. i'm a midwest girl, so the deer heads up on the wall in this next story, i didn't even notice them. all i noticed was her results. >> i was able to pop in the dvd and do my workout. i never thought that i would have been able to lose the weight that i did. with piyo, i've lost 15 pounds and i feel amazing. >> i've never tried yoga, i've never done pilates. i started slow. i kept at