Insanity

Insanity is a workout regimen similar to P90X in that it claims to improve fitness in 60 days through strenuous stamina training. Developed by Shaun T., Insanity’s advertising emphasizes “max interval training”, a method of exercising during which one works out strenuously for 3-4 minutes and then rests or “cools down” for approximately 30 seconds before starting the whole process over again. This is essentially a reversal of traditional interval training, during which participants exercise mildly for 3-4 minutes and then exercise strenuously for 30 seconds.