With nothing more than a pair of sneakers and a piece of twine with handles, you can burn about 100 calories in just eight minutes. "It's a great exercise) to keep your heart rate up in between sets at the gym, as part of a larger workout," says Cameron. They key is using the right posture — neck relaxed, gaze ahead, chest lifted and shoulders lowered — and engaging ab muscles, which will protect your lower back and knees while you jump.
Source: Jorg Badura
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