Shirt off??? Think maybe twice. Guys posing? Fuck man... The turds in my gym just love to pull stuff off like that. Not a routine style, but do a FDB for a sec. make a bad looking face then fuck off. I feel absurdly ashamed for them when I see this.
Many at my gym run to the changing room to quickly take selfies while pumped. I used to get mad but see it more and more as comedic value. I blurted out laughing watching the guy with his "bane" mask to his pullups, oh brother....