as a general rule-
small and fast= running back, qb, or even safty (usually around 150 lbs)
medium sized= usually line backers, tight ends, defensive ends (usually around 200 lbs)
large= usually linemen on the offense and defense (usually 225 lbs or higher)
* if you are really want to play good, lifting is the key *
i am 250 lbs and 6'3" and i play offensive tackle and defensive tackle
i am a senior in high school- 18 yrs old
to me football is a lot of fun, but you must work very hard to be good
just remember- lift and run - it is very important to be good
and above all else- join to have fun