You eat a lot of junk food, then you'll be fat!!
Yes fullbacks, halfbacks (this term is no longer often used), and tailbacks are all running backs. The fullback is usually the bigger running back in a two back formation, and although he does carry the football or catch passes on ocassion, the fullback is usually used as a lead blocker or to help protect the quarterback on a passing play.
Running back.
running back
running back
Running back
Running Back
Running back.
Yes, the two positions are similar in the running game.
Running Back
running back for the cowboys.
probably not
Running Back