To clear things up, there is a major difference between a jock and athletes. Jocks tend to abuse their popularity, while the athletes don't really mind who they talk to or hang out with.
Signs of a jock: Rude, arrogant, stupid, beats up people, dates only cheerleaders and hangs around other jocks
Signs of a true athlete: Love their sport, try to stay down-to-earth (a little arrogance is expected), hang out with whoever they want, date whoever they want, might beat people up but that doesn't mean it was uncalled for.