Joe Swanson Syndrome

Occurs when someone goes further than skipping leg day, but completely neglects them. The result is an individual who has scrawny legs and a masculine upper body.

Athlete 1: Man dude, I just benched 405!
Athlete 2: What's your squat?
Athlete 1: Squat? 135.
Bystander 1: Man, that guy has some serious Joe Swanson Syndrome.