a new low-impact weight-loss and body-sculpting miracle from fitness and nutrition sensation chalene johnson that takes the best of pilates, the best of yoga, and fuses them together into one incredible program. >> i've combined the best of pilates and yoga to give you flat abs and a sculpted body and flexibility but with sequences that deliver a fat-burning cardio workout at the same time. >> i'm actually in better shape and smaller now than i was before i got pregnant. >> you just don't expect to have a six-pack after children. i have a six-pack at 40. >> announcer: and were going to show you just how something as low-impact and fun as piyo has quickly become the latest phenomenon from the biggest name in fitness, beachbody, the company behind p90x, insanity, and the 21-day fix. and today, cha maria menounos, the ultimate authority of what's hot in hollywood, to share incredible stories from people who changed their bodies thanks to piyo. >> i've lost 40 pounds and 5 full dress sizes. [ applause ] >> announcer: and how some people even used this low-impact miracle to completely change thei