A programmable Yoga workout DVD, with mix-and-match segments to create routines that are 34, 50 or 60 minutes long. Bob Harper from The Biggest Loser show instructs.

Intermediate exercisers, preferably with some Yoga experience. If your fitness level matches that of the contestants on The Biggest Loser when they first arrive at camp, this workout will be too tough for you. You need some level of fitness to make it through even the initial segment without becoming discouraged. You will need a mat — a light medicine ball is optional, as are light weights (although the segment using the weights definitely works better with them).

If you're read some of my other reviews, you might already know how much I loathe Yoga DVDs that have "weight loss" in their title. I am always pointing out that Yoga is good for flexibility and toning, but on its own, it's a lousy weight loss tool. Well, I finally found the exception: this is one butt-kicking Yoga DVD! Harper puts a strength-training spin on Yoga and does not let you off easy. The first segment is a 20-minute routine that includes many classic standing Yoga poses, but Bob throws in enough push-ups and other challenges to take you out of any comfort zone you may have. The second segment is about 15-minutes long and combines Yoga and Pilates in some really tough combinations (I've been known to consider Plank a resting pose, but the way Harper had me doing it was making even me want to scream). This segment uses a light medicine ball for an extra challenge (if you're up for it!). The final, 10-minute segment combines Yoga poses with light weights for an authentic full-body sculpting session (I actually found this segment to be the easiest, even though it's part of the most advanced workout). You can program this DVD so that you build up from the first routine (plus warm-up and cool down) to all three segments over the course of a few weeks. If you do it regularly, you will build muscle and, I imagine, drop a few pounds too.