Fitness rule 1: Don't get comfortable.
It is often said that when you get comfortable with your workout, you burn fewer calories. The greater the intensity of your workout the more calories you burn during your session and even post your session. The more intense your workout, the more oxygen your muscles need post-workout to recover and repair themselves, which in turn burns more calories.
We're rounding up a few workouts to try that burn the most calories in the least amount of time.
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