Sometimes I flex the muscle I'm working in between sets. It helps me get that 'mind-muscle' connection before starting the next set. Another guy at my gym does full poses and mini posing routines right in the middle of his work out. A couple of days ago, I asked him if he was going to compete in the local show coming up and he said that he doesn't compete.
I just assumed he was if he's practicing his posing. He said that posing is vital to do as much as possible. He said it's to create the separations and striations in the muscles.
Is posing really that vital for non-competitive bodybuilders ?