Maximum interval training. The classic interval training makes you go for high intensity for a shorter period of time than you go for light or medium intensity. Insanity makes you go the other way around: longer maximum effort (extremely intense) and then short breaks. It includes mainly cardio and plyometrics (jumping) + stretching. One might argue that there is a little bit of strength training (because of e.g. squats and push-ups). But, on the other hand, some people consider exercising a weight training only if you actually use heavy weights/dumbells. Depends on your definition of strength/weight training.
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it was a mark of insanity
There are trade schools specifically devoted to this type of training. The name for this type of training is "journeyman training".
No, insanity is the antonym of sanity.
The important training.
See Answers.com page for insanity: http://www.answers.com/topic/quote-4?subject=Insanity&s2=Insanity
Insanity Radio was created in 1998.
Fragments of Insanity was created in 1989.
Divine Insanity was created in 2007.
Edge of Insanity was created in 1985.
NO! From Insanity Claus: YES I DO! http://insanityclaus-music.blogspot.com/2006/08/who-is-insanity-claus.html
Crazy training