Observe; the muscular man attracting a mate in his natural habitat.
He sees the weights he wants and quickly advances towards them. He maintains eye contact to make clear his desires yet acts casual as best as he can by walking with a swagger. Once he has claimed his irons he can take as much time as possible to check his phone, watch his reflection, and speak softly to himself in his best tough guy voice. Timing must be precise so that women may be safely distracted by his masculinity, as determined by the size of the weight he has chosen. A male specimen who is not as strong as the others must make up for his lacking bicep circumference by extra bold clothing color selections or obscenely loud music with his headphones. The female may notice one of these secondary characteristics.
Now it is time to lift these weights; form and function are irrelevant. The sound of the effort is most significant, as the male grunts with each repetition. Grunts may be replaced by yells, words, or curses as long as they can be heard throughout the gym. The more attention he can attract the better as his admirers look on. Other males stare with looks of disdain as he beats his chest by letting the weights fall as loudly as possible. Now he must strut the gym floor to show his dominance by the swagger in his walk. If a suitable female has not approached him, he must continue. If a potential mate has been met with eye contact, he can retreat to a quieter exercise to let another male make his presence known. This will repeat until a mate is found or until the male concedes protein shakes for beers and search for a female that doesn’t squat.
For the record, a lot of my friends are big guys who lift heavy, grunt loud, swear a lot, and slam the weights. I wrote this after a session with one of my clients where there were many men being extra loud and we laughed as they tried to outdo each other. The gym really is a place to attract attention to your physical strength and I see guys hitting on girls all the time this way (the other way around too of course)! National Geographic should be looking into this, really.