Is there a superfast workout I can get in before leaving the house in the morning? Something I can do in 10 minutes or less, before I head out to work? —JOSE C., MIAMI, FL We have one you can do in four minutes. Professor Izumi Tabata, a researcher at the National Institute of Fitness and Sports in Tokyo, found that brutally intense interval workouts lasting just four minutes improved endurance better than more conventional interval training—and they even increased fat burning
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Lose Weight Fast: The One-Exercise, 10-Minute Fat-Burning Workout