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Denise Austin: Shrink Belly Fat ($9, deniseaustin.com)
What you'll need: A 3- to 8-pound dumbbell, a yoga mat
Calories burned: 198 per 45-minute workout
The skinny: Whether you string together all three 15-minute core workouts -- classic ab exercises, a more advanced routine that includes moving planks and Turkish get-ups, and a cardio calorie blaster -- or do them separately, expect to "feel the burn" and to be "eager to repeat [them] over and over." The "very encouraging" Austin points out modifications being done by the exercisers behind her. Testers said they could easily figure out what level they were on as well as see what goals they could advance toward.