1. They represent health and vitality.
2. Their strength suggests sexual potency.
3. They are able to protect us from a dangerous world.
4. They suggest the wealth necessary to spend hours at the gym.
The ideal male physique displays symmetry and definition, with every muscle group visible. The muscles should be big, but not so big that they stand out, calling attention to themselves and ruining the symmetry.
Some guys, however, prefer size to symmetry. A combination of genetics, over-training, and steroids lead to huge over-development of some muscle groups.
The biceps and triceps are particularly easy to over-train. When your bicep is bigger than your head and your triceps look like goiters, the symmetry of your physique is ruined.
Where does the tricep end and the chest begin?
If this isn't photoshopped, this guy has over-developed his trapezius, biceps, triceps, and calves.
That's got to be photoshopped.
Why do they do it? According to extreme bodybuilder Greg Valentino, it's about the challenge, about getting as big as they possibly can.
Who cares about symmetry? Who cares about physical attractiveness? Who cares about what other bodybuilders think?
Size is all that matters.