chris and heidi powell have been in the business of transforming lives for a long time. the health and fitness experts gained notoriety on their hit television show "extreme weight loss" where they helped a select few lose weight every season. when the show finally ended they had a chance to turn their attention to the rest of us. they've developed a format where you can try out their workouts and coaching one on one. >>> the partnership between chris and heidi powell is not for the faint of powell. between their four kids, multiple businesses, and working out, this dynamic duo never seems to sleep. the personal trainers and diet and fitness experts became personal trainers of nbc's show "extreme weight loss." >> you are a champ. >>> but the scope of that show limited them to helping a few each year. >> when they air thad episode around the world, we were getting tens of thousands of letters, which is really overwhelming. who are we to say no. >> since the show finished, the pair have written books, but they've taken the ethos and shared it with the masses. >> thank good