The body acclimates to repeated challenges, making it necessary to change your cardio routine every four to six weeks. If you run three times a week for 30 minutes, then switch it up and take a couple of 60-minute spin classes or hit the rowing machine. Add interval training to your workouts if you're ready — playing with your speed in a workout really unsettles the body's sense of caloric equilibrium. Interval training burns serious calories and boosts your metabolism as well.
Change Your Cardio Routine
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