In this extended version of her Boot Camp workout, the energetic Tracey Mallet and her crew (appropriately attired in military-style clothes) demonstrate a three-part routine that is definitely not for new recruits to exercise. The first workout mixes the chasses and sautés of aerobic dance, a little Tae Kwon Do, and the jumping jacks and push-ups of military basic training. ("Your pain, your gain," she announces during the excruciating second set of push-ups.) Workout 2 begins with some Tai Chi and then alternates kickboxing with hand-weight work. The final routine combines the jumps of the first with the "martial dance" of the second. Mallet has an unflagging enthusiasm and a taste for variety that makes this workout a long way from dull. However, with drums pounding in the background and jumps galore, this 48-minute workout is definitely for the young or the young-at-heart-and-knee-joints. --Kimberly Heinrichs