14. Mountain Climbers

Mountain climbers are fantastic muffin top exercises, and although they're simple, they're very intense. You start out in the same position used for a standard push-up, so you're basically on your hands and your toes.

Once there, pull your right knee in toward your chest, with your foot still resting on the floor. Then you want to jump up and, while you're in the air, switch your feet, so that when you resume the position, your left knee is against your chest and your right leg is switched out behind you. Repeat this as quickly but as safely as you can for about a minute.

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