High intensity interval training (HIIT) has been shown to be one of the best forms of exercise in terms of both effectiveness and efficiency. In fact, the evidence shows that by focusing on endurance-type exercises, such as jogging on a treadmill, you actually forgo many of the most profound benefits of exercise.
The problem is that many are so out of shape and/or overweight, the idea of high intensity interval exercises can seem too daunting to even attempt. The elderly may also shy away from high intensity exercises, for fear of injuring themselves.
