Intense cardio sessions burn boatloads of calories, but what about that walk in the park or that Zumba class? We've compared a list of workouts for the fastest burn. Can you believe kettlebells burn so many calories?
Shape Up: How to Do a 1-Hour Workout in 30 Minutes
Lauren Conrad's treadmill interval workout
Tone It Up: The 3-Minute Thighs Workout
Ready to go? Grab a pair of 3-5 pound dumbbells for the first four exercises and get ready to feel the burn!