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Jeanette Jenkins Blast the Belly Fat ($20, thehollywoodtrainer.com)
What you'll need: a stability ball, a yoga mat, a pair of 3- to 5-pound dumbbells
Calories burned:* 128 per 15-minute circuit, 29 per 9-minute ab routine
Why we love it: Testers vow to use this cardio and toning DVD "over and over again." It includes a playground-inspired warm-up with the stability ball and three high-energy routines, each about 15 minutes, that use the ball and hand weights; think lunge-punch combos and squat presses. Finish off with a quick Pilates-based ab series. Testers' verdict: "Definitely hard-core, but doable"; plus, switching from weight work to cardio makes the time fly by. Props to instructor Jenkins for her "very motivating style without being too aggressive."
Originally published in FITNESS magazine, March 2011.