Means were are talking INSANITY.... INSANITY is weak shit compared to CrossFit
Our Baseball and Football coach encourage us to do CrossFit workouts after school with them during offseason if we aren't do any other sports... Pretty much a insane workout that is all about reps, speed, and basics... It is a timed workout.
There are competitions but they are very very insane.
There are CrossFit workouts for beginners out on the interwebs somewhere if you really care to try it out... You need a gym though..