1. A running back, not only run the ball, but they run routes and catch passes. They also block for the QB on passes and other running backs.
2. There are rules, just like in any other sport/game.
3. Defensive ends don't play offense, but a player can play on both(usually don't happen in College and Pro's)
4 Linebackers have to fight off the blocks of 300+ lbs offensive linemen and are usually involved in a lot of contact, you do have some leaner/ quicker linebackers, they usually rush the QB and cover Tight ends and running backs on pass plays.
2. There are rules, just like in any other sport/game.
3. Defensive ends don't play offense, but a player can play on both(usually don't happen in College and Pro's)
4 Linebackers have to fight off the blocks of 300+ lbs offensive linemen and are usually involved in a lot of contact, you do have some leaner/ quicker linebackers, they usually rush the QB and cover Tight ends and running backs on pass plays.