If you're starting a workout program that calls itself "Insanity ® by Beachbody," you know it's going to be over the top. This is one of the most challenging fitness programs on the market. Insanity ...

The Insanity workout is an advanced exercise program. It involves bodyweight exercises and high-intensity interval training. Insanity workouts are performed 20 to 60 minutes at a time, 6 days a week ...