Free Online HD on Lookmovie. This intense lower body workout is based on a technique called contrast training. This method kick starts muscle growth by shocking your muscles into recruiting additional high threshold muscle fibers, thereby increasing strength and lean body mass. In this workout you'll do a weighted exercise followed by an explosive plyometric exercise for several rounds to stimulate muscle growth in the lower body. Lift It Hiit It Legs is sure to help you break through plateaus and recharge your lower body workout routine.