I am not a BB and never will be a BB. I am a weight lifter and I am a person that has been exposed to severe conditioning.
The Military thrives on over training. It tests the body and your mental capacity. For its purpose it works. Dan Duchaine was very adamant about NO ATP REPLENTISHMENT during sets and to cycle intense training weekly.
The correct way for BB to use Clen to stimulate muscle growth is 100% overtraining a body part and cycling that body part with the other parts weekly.
Overtraining is a tool and used correctly it has its uses.