Long breaks between sets or steady-state cardio don’t do your body any favors when you're trying to lean out. Instead, use intervals—periods of intense training (high reps or maximum effort) with short periods of rest in between— to increase your routine's fat-burning potential. (This full-body Tabata workout is a good example.) “You can get in a 30-minute workout, but an intense one that’s just as good as an hour of a slow one,” says Jim White, R.D., a spokesperson for the Academy of Nutrition and Dietetics. “It will burn up more calories, break the monotony, and will get the metabolism going.”
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