people say its myth and ive gone with that belief but i and they were wrong. The proof is in the damage around the house and the gf that wouldnt even be around me while on. YES everyone is different. But if you are geared to being a hardcore trainer you WILL be a hardass til the pump subsides or till your mind has taken an intensity break-i know after 17 years. That gear will make you a bigger asshole OH YEAH