I'm pretty sure males theoretically evolved to be bigger than females through sexual selection. Less educated people go through life driven by instincts rather than reason. Society tells you in so many ways that bigger and stronger is more masculine. Because you have insecurities about your manhood, possibly from being cheated on, you seek out way to become more masculine. The kid from the Brady Bunch would hang from the swing set to try and grow taller. So many men dedicate a large amount of time in an endless quest for more mass (masculinity). It's called body dysmorphia. I never read about anyone in the history books because of their weight lifting ability