Jock's free time is often focused entirely on sports, drinking, and dating that one really attractive girl in high school who must have self-esteem issues because he treats her like crap and I'm so much better for you Kaylin! Why won't you dump... sorry went off in another direction there.
but it takes an excess of time to be a nerd, between, not just watching but studying movies, playing RPGs, Adventure games, and anything but Madden and halo/call of duty, watching anime, reading comics/manga, and designing programs. you need A LOT of free time to be a nerd as well.
the two just can't really exist in the same person. A jock may enjoy anime or video games that aren't the two mentioned above but they can't obsess over them the way a nerd can no matter how hard they try.
At least we have conventions, raves, and movie parties or premiers where WE can find others with common interests, It's really the only way I've been able to make friends or find dates lately.