On one hand, I skate, snowboard, and come across as "normal". I wear glasses, but nobody that knows me would say I look like a nerd. I'm not super scrawny, but I am very "lean": tall but with a bit of muscle. I spend alot of time outside either backpacking, fishing, or at a shooting range. In fact, most people probably see me as being really laid back all the time, even when the pressure is on.
(In before the "OMG, skool shootingz" s***storm, I'm a qualified NRA marksman and was casually offered a job as a riflery merit badge instructor at a Boy Scout camp by one of the senior staff. I turned it down because I disagree with alot of my council's policies regarding the exclusion of kids based on sexual orientation and religion)
However, I'd be lying if I told you I wasn't a nerd at all. I'm a gamer, I've played Magic the Gathering for 7 years and still do, I watch anime and I'm online alot when I get bored, so you can decide for yourselves how much of a nerd I am.