Gym Fails That Will Totally Make You Skip Your Next Workout

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High-intensity interval training  (HIIT) mixes up periods of intense work, like sprints, with periods of low-intensity, like jogging or walking; it’s a great method for causing your metabolic rate to fluctuate, which causes you to burn more calories; low-intensity interval training is a waste of time and space. Sitting on a chair — not even standing! — to watch TV on a gym treadmill is sad. And it’s even worse when you’re doing it in gym attire.