Long, slow cardio workouts are great for relieving stress or if you're training for a race, but adding fast-paced intervals will help alleviate boredom, diminish belly fat, and make you stronger.

Whether you get your heart rate up by running, using an elliptical, swimming, jumping rope, or biking, include short sprinting bursts throughout your workout. Add 10- to 60-second sprints every few minutes, slowing down to a moderate pace just long enough to catch your breath between them. These sprints will build and tone muscles and increase your endurance.

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