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SparkPeople Total Body Sculpting with Coach Nicole ($17, amazon.com)
What you'll need: A pair of 3- to 8-pound dumbbells, a yoga mat, a chair
Calories burned: 379 per 69-minute workout
The skinny: Not only is instructor Nicole Nichols like "the girl from work who you hit the gym with," but also her backup demonstrators are "refreshingly normal-size." Nichols leads you through three short, effective routines -- strength, barre, and a fat-burning circuit -- totaling about an hour at a pace at which "everyone should be able to keep up." Multitasking moves, like the pliť squat with a heel lift, make it feel as if you aren't wasting a second.