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Amy Dixon: Breathless Body, $20, amazon.com
What you'll need: no equipment
Calories burned: 515 during a 55-minute routine
The skinny: "Breathless Body is definitely a fitting title" for Amy Dixon's cardio interval workout based on the Tabata method; it will have you "sweating during the very first drill." Crank out as many reps as possible of one move, like burpees or high knees, for 20 seconds, rest for 10 and repeat seven times before moving on to the next exercise. Three levels of intensity are modeled, so you can choose how turbo you go. The options inspired one reader to make "a goal of finishing the entire DVD on the highest level."