The majority of users of the "Insanity Workout" give it five stars on a one to five star rating scale. Experts who have evaluated the "Insanity Workout" also rate it highly, but warn it is not for beginners. The program is intended for individuals who are already physically fit.
The "Insanity Workout" is a high-intensity interval training program. It uses the concept of maximal interval training with 3 minutes of very intense exercise followed by only 30 seconds of rest. The program provides ten different workouts that each take 30 to 60 minutes to complete. The user is supposed to rotate through the workouts 6 days per week. The exercises focus on cardiovascular fitness and on building muscle strength.