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Jillian Michaels: Body Revolution ($99, amazon.com)
Beginner to advanced
What you'll need: A resistance tube, a pair each of 3-, 5-, and 10-pound dumbbells, a yoga mat (all optional)
Calories burned: 232 per 30-minute workout
The skinny: "Anyone without a gym membership should own this" 15-disc set, one reviewer said. The "passionate" Biggest Loser pro leads you through a 90-day program designed to burn fat and build muscle in 30 minutes. Expect circuit training that progresses in intensity (a basic squat on disc one turns into a single-leg squat with a reverse fly on a later disc). "No wonder people get results," said one satisfied tester midway through this plan.