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Amy Dixon's Breathless Body, Volume 2: The Edge ($20, amazon.com)
What you'll need: Nada
Calories burned: 409 per 55-minute workout
The skinny: This "no-excuses" high-intensity interval routine had testers pushing to the edge. Sweat-in-place exercises like plank jacks and tuck jumps are highlighted on-screen at the start of the workout, so you know what's coming up. Whether you choose the beginner, intermediate, or advanced level, "it's definitely a challenge, no matter where you are," especially the last six minutes of nonstop 30-second drills.