Although this has changed somewhat in recent years, one of the most fundamental characteristics of the bro has often been considered the presence of muscles. Whether large, small, or lurking beneath the shadows, the bicep has, at least to some, symbolized the menacing force of masculinity, in iterations both sexy and scary.For this episode of Ask a Bro, host Lauren Oyler lingered outside a gym in LA in hopes of understanding the men behind the muscles. Why do they work out? How does one optimize one's quad routine? What does it feel like to be really, really good-looking?