The Interval Training Workout, co-written by a doctor and a certified trainer, shows how interval training can be done practically anywhere and benefit anyone who wants to get healthy. The training has three key components: Interval training workouts with brief repetitions of intense exercise alternating with intervals of rest; (extended) workouts: longer weekly sessions which allow certain biochemical and muscular adaptations that improve fitness and burn fat; and active rest days: steady, comfortably paced exercises that help the body rest and recover while still burning calories. The book...