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Personal Training with Jackie: Xtreme Timesaver Training ($15, collagevideo.com)
What you'll need: a pair of 3- to 5-pound dumbbells
Calories burned:* 255 per 32-minute circuit
Why we love it: The star of Bravo's reality show Thintervention with Jackie Warner shares her training secrets in this "well-rounded" heart-pumping workout featuring back-to-back full-body moves. "You can do anything for a minute" is Warner's mantra, and it works. Testers of all levels found her "motivating." The routine takes only about 30 minutes, but "even your ankles will be sweating" after cardio-sculpt moves like lunge-punch-kick combos.