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Bob Harper Inside Out Method Pure Burn Super Strength ($15, amazon.com)
What you'll need: a pair of 3- to 10-pound dumbbells
Calories burned:* 64 per 20-minute routine, 572 per 67-minute circuit
Why we love it: This "all business" head-to-toe workout shows another side of Harper, The Biggest Loser's good cop. "Bob really pushes you to do more reps," testers say. They hustled through nonstop multimuscle strength moves, like biceps curls in squat position and jumping lunges using a dumbbell. "You hear one of the exercisers on the DVD pant, 'This is crazy!'" Testers dug the countdown clock at the bottom of the screen. "This DVD won't waste your time." Try the 20-minute segment as a primer for the full circuit.