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Here from Sean Foyexercise physiologist and coauthor of the million-copy bestseller The Daniel Planis The Burst! Workout, a complete program for 10-minute interval and circuit workouts that can be done practically anywhere, anytime. Study after study proves the effectiveness of high-intensity interval training. Now, heres exactly how to do it four minutes to raise the heart rate and metabolism three minutes of resistance training to strengthen muscles and bones two minutes of core movements for the abs and back one minute of deep breathing and stretching a vital component missing from other popular highintensity circuit programs. The book features three four-week programs Level 1, with no equipment required, perfect for the office and fighting the sitting disease Level 2, with minimal equipment and Level 3, which brings interval training to the gym.