Quote ="stew88_RL"only the nose defensive tackles and to a lesser extent the offensive guards and centre are huge, but these are the exception. the other linesmen are generally very fast and have great acceleration, especially the defensive ends who love to get at the QB quick despite being well over 6ft and hefty themselves.
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Sometimes even those big guys will display surprising athleticism. Last November I was watching the NCAA Big 12 game between Nebraska and Colorado on TV. Nebraska's Ndamukong Suh, a defensive linemen who's 6'4" and weighs 300 pounds, intercepted a Colorado pass and took it 30 yards the other way for a touchdown. If I hadn't seen it myself, I'd never have believed a guy that big would have that type of ability. Considering how many guys there are playing college football in the US, there are likely a significant number capable of playing RL too.