My friend does it because he says it inflates his muscles temporarily, just long enough to make a better first impression haha. Just wondering if there's truth to this.
Well it is obvious if you look in the mirror after a workout, but I don't think it lasts for more than an hour after. It is the effect of blood rushing to the muscles away from where it is not needed.
I also read that as the muscles break down they actually get smaller after that one hour, until they rebuild over the course of a few days... if I'm going out 3 hours after a workout, best I don't work out then lol?
I agree that I always thought it was pretty silly. I think the pump does go away pretty quickly.
But what it does do is if it makes them feel better about themselves, even superficially, than it probably still has some positive results when going out.