If you don’t feel like going for a boring old run, adding some intervals will help you pass the time—and burn more calories. Find a hill, Lee suggests, and sprint up it for 15 seconds. Take 45 seconds to recover slowly back down; repeat 10 times. These types of speed intervals can be added to any cardio exercise—the elliptical at the gym, swimming in the pool (minus the hill, obviously), or biking in the park, she adds. And science shows they work, too: Tabata training, a type of four-minute interval that alternates 20 seconds all-out effort with 10 seconds of recovery, has been shown to blast 13.5 calories a minute!
Fitness Tip courtesy of: SELF