A Workout to Reverse Aging Professional trainers know that high-intensity interval training is a super-effective way to burn fat and get ripped. However, research shows that this popular exercise approach also improves heart and cellular health, prevents disease and enhances athletic performance for older adults--regardless of age. The scientifically proven fitness routines in Staying Young with Interval Training take much less time than conventional workouts, so you can quickly gain: - Greater flexibility for an active lifestyle - Muscle and core strength to stay in the game - Increased energy for the things you love - Optimal health to live longer and fitter - A leaner physique with fat-burning stamina