dr. marcus elliott, a harvard-trained physician specializing in sports science and the training of professional athletes, whether this innovative approach to body-shredding was the real deal. >> sagi's dynamic set training allows you to stress muscles. it allows you to do this high-intensity work without using really big weights. it's all about the way he's layered his program, the way he's combined these different fatiguing and pre-fatiguing exercises. if you're interested in taking an at-home weight program and making it effective, sagi can help you with body beast. >> once you start the dynamic set training principle you don't really have to use massive, heavy weights. using the body beast program i've dropped 35 pounds. i've slimmed down. i've just replaced the fat with muscle. >> body beast is not just for guys. if you're female, you'll love body beast. you'll see amazing results. i have. i have the pictures to prove it. [ laughs ] >> before i started body beast i was overweight. i didn't like myself. i didn't like the way i looked. i didn't like the way i felt. my knees always hurt. the s