If you're into aerobics, which means doing something non-stop for an extended period of time, then this tape is for you. Jack, Elaine, and their family take you through two 30-minute rigorous exercise and aerobic workouts that cover every inch of your body from your head right down to your toes. "The key to staying fit is exercising and changing the way you exercise," Jack has often said, and this tape provides enough variety to satisfy even the serious body builder.