High-Intensity Interval Training (HIIT) is a form of exercise done in short, intense bursts. Studies show HIIT can increase the efficiency of an exercise and have a lasting impact on metabolism after completion. Dr.Weil's colleague, Dr. Jim Nicolai, demonstrates how to perform HIIT on a stationary bicycle. Dr. Nicolai's profile: www.drweil.com/drw/u/PAG00314/Dr-Weil-About-Us-Experts.html#jimn Check out Dr. Jim Nicolai's website: drjimnicolai.com/