Who doesn’t want to get more for less? That’s the beauty of high-intensity interval training (HIIT), a proven training method that’s become a workout staple for fitness enthusiasts everywhere. Most HIIT workouts are a combination of short, all-out bursts of intensity followed by some much-needed catch-your-breath recovery periods. "A HIIT workout is typically done with interval bursts at 90–95% of max heart rate for no more than 60 seconds," says Michele Olson, Ph.D., an exercise physiologist at Auburn University-Montgomery. The payoff: "You’ll get about the same fitness benefits in 10 minutes as you would jogging for a half hour."