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Pure Barre Mile High: 2 ($20, purebarre.com)
What you'll need: A 5-inch playground ball or a rolled-up towel, a yoga mat, a chair
Calories burned: 153 per 33-minute workout
The skinny: This ballet-inspired workout, led by Carrie Dorr, the founder of Pure Barre, is broken up by body part -- legs, butt, and core -- and each section alternates sculpting sets with stretches. Testers appreciated that their abs "burned by the end" and that their thighs were "shaky all the way through" the tiny pulsing exercises like inner-thigh ball squeezes in plank and while standing. "It felt as if my buns were lifted as soon as I finished!" one reader raved.