serious question bro, if your Imam discovered you were posting your half-naked body on the internet and urging other men to do so, sharing pics and commenting on each other's bodies, would you be embarrassed? would he give you shit? would you tell him to go fuck himself?
in Islam a man should cover the area from his bellybutton to the knees, so he may not say anything if i posted a shirtless picture. you can view the picture issue in two ways.
one is showing your dedication and hard work, and to get motivated or get feedback. and i don't and no one will see anything wrong with that. even an imam won't say anything to that.
the second is for gay/schoming and he will tell you off for that, if you inner conscious doesn't tell you first that is.