After you've pushed through a set or two of mountain climbers, you're sure you've burned off all your breakfast calories -- and maybe some from lunch, too. This intense exercise, in which you get into the top of a pushup and quickly alternate stepping your feet to your hands, does burn loads of calories. But sustaining mountain climbers for more than just a minute or two is incredibly challenging. Combine mountain climbers with other calisthenics, such as jumping jacks, body-weight lunges and burpees, to burn around 300 calories in 30 minutes.
A smaller person burns fewer calories doing mountain climbers than a larger person. If you do a 60-second set of the climbers, expect to burn about 8 calories if you weigh 125 pounds, 10 calories if you weigh 155 pounds and 12 calories if you weigh 185 pounds.