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Jillian Michaels: Ripped in 30 $15, amazon.com
What you'll need: a pair of 3- to 8-pound dumbbells
Calories burned: 222 to 250 calories per 24-minute workout
The skinny: Jillian Michaels' winning formula? Strength-and-cardio sessions built on three minutes of toning (like alternating lunges with biceps curls), two minutes of cardio (speed skaters), and one minute of ab moves (elbow-to-knee planks). Follow one of four half-hour workouts each week from the "motivating," no-excuses former Biggest Loser trainer for a "sweat-tastic" routine. One new-mom tester found that "the quick workout options are perfect for burning calories during naptime or before work."