Cardio: Why intervals are important Conrad recommends doing cardio intervals for two reasons. First, you won't have to spend as much time doing cardio because intervals change your body in shorter periods of time. Second, because intervals force your body to switch gears quickly, "you'll burn more calories while exercising and throughout the day," she says. You can do your cardio on a treadmill or outside, as long as you have a watch handy.
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