10 Pounds Down: Better Body Blast $15, amazon.com
What you'll need: a pair of 5-pound dumbbells, a yoga mat
Calories burned: 62 to 189 calories per 20-minute routine
The skinny: Choose from three 20-minute target-toning routines -- arms, abs, legs -- which are "easy to fit into a busy schedule," or do them back-to-back for a "megaworkout." Alternate between "killer" strength exercises, like side lunges with knee raises and kickboxing-inspired cardio blasts that "keep my heart rate up." Trainer Jessica Smith offers "many variations I've never seen before," such as an on-all-fours bicycle crunch.
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