To size up a gym bro, don't look at his bench press — look at his eyes when he checks the mirror post-set. That isn't vanity, it's confirmation. He just made love to the weights and now wants to see the trophy. The mirror isn't Narcissus' pool to him; it's an altar for review.
The pump is faith
When a gym bro says 'the pump,' he doesn't mean a physics term — he means a religious experience. Those two minutes after a failure set, when blood floods the muscle belly, he feels capable of anything. That brief divinity is the secret fuel that lets him laugh through every shitty thing life throws. You mock his devotion; he pities you for never feeling it.
The asceticism of the training diet
Outsiders see the training diet as suffering; the gym bro sees it as practice. 'Diet is seven parts, training three' — he believes it more than anyone. The man who can eat a lifetime of chicken, oats and broccoli with discipline has a grip on desire you can't imagine. That 'hard on himself' restraint is exactly the hormone that kills in this scene.
The self-gaze before the mirror
A gym bro's relationship with the mirror runs deeper than with most people. It isn't vanity, it's a long, honest stare: did the circumference drop today, are the lines sharper. The negotiation he completes with himself before the glass is more serious than many relationships. Get this and you understand why the gym is the quietest yet most intense field in the jock universe.