Well, if you read this
It has to be.
Whenever I read about those programs I read about lots of injuries, so it must be smth like that
edit: it is.
Well the crossfit retardation is on a whole other level than insanity, freeletics, p90x.
Problem with crossfit is the dangerous and ineffective training method, problem with those other 3 is that they are great if you want to lose weight in a fun way, but that they are sold as if you'll get jacked from them.