May 28, 2009 12:23 PM
We know a workout video is good when we’re whimpering and sweating like pigs less than fifteen minutes in, but we can’t stop because it hurts so good, and that has to do something for our asses. Jillian Michaels' Banish Fat, Boost Metabolism is that kind of video. Best known for her gut-punishing workouts on The Biggest Loser, (We know you watch it. Admit it.) Jillian takes us through a warmup, cooldown, and a 40-minute circuit workout that increases your heart rate with increasingly challenging intervals. And, as her enviably ripped abs and biceps boast, interval workouts are the best for your metabolism and muscles. Just make sure you have a huge bottle of water and a towel handy – to mop up your tears.