Quote Originally Posted by DeathKnight
You have to qualify into the tall/strong category to even have a chance in [American Football].
Kicker/Punter
Free/Strong Safety (yeah you need it, but not to a great degree)
Wideout (it can't hurt to be)
Running Back (it can't hurt to be)
Kick/Punt Receiver
Tight End (by a technicality, but this does require strength)

None of these positions need you to be strong or huge.
You need to be fast, agile, and have excellent hand control/grip.

Kicker/Punter needs great leg strength and accuracy. David Akers and Adam Vinateri are tiny, miniscule, strings of bone compared to the other positions.

And really for any of the other offensive line positions, as long as you can keep the opponent's defensive players away from the QB, you'll be fine. For Defense, if you can GET to the QB, you'll be fine. This just happens to require strength in most cases.