one blocks, one runs
full back
Better half back if he is playing off Benji otherwise a talent in fullback too. When Benji and him are together they are an unbeatable force especially when they are both on their game.
Quaterback, Halfback, Fullback, Tight End, Wide Receiver, Tackle, Guard, Center.
A quarter mean 1/4 of something. Thus there are four diffenent backs on offense. Quarterback, Fullback, Running Back, and Halfback.
The abbreviation for running back is RB. There are two types of running back ... halfback (HB) and fullback (FB).
Other positions besides quarterback and halfback/running back that have won the the Heisman Trophy are: end, fullback, wide receiver, wing back, and defensive back.
At one time in American Football, all four players in the backfield stood fairly close together. One stood slightly behind the rest. He was called the fullback. The backfield players were given names according to how far back they were from the front line or line of scrimmage. The closest player was the quarterback. Then came the halfback(s). Then came the fullback. If a halfback played off to the side, he was a wing back or wing. If he played far out to the side, he was a wide out. Normally halfbacks weighed less than fullbacks. Sometimes, a halfback will play as far back as the full back. Then he would be called a tailback.
Backs are called backs because they are in back of the line of scrimmage. In the old tee-formation, the farthest offensive guy from the line of scrimmage was the fullback, because he was all the way at the end of the tee. Similarly, the halfback was positioned halfway between the fullback and the line of scrimmage, and the quarterback was positioned one-fourth of the way between the line of scrimmage and the fullback. Other formations, of course, are used these days, but the old names for the positions has persisted.
My son thinks it would be the fullback, who can also run the ball. But he thinks it could also be the guard. -----Your son knows his football Crystal. There are five offensive lineman whose primary job is to block: one center who snaps the ball to the quarterback, two guards, and two tackles. The fullback is a running back who lines up near the halfback, is usually bigger than the halfback, and helps to block when the halfback is given the ball.
Positions get their names by where they are at on the field. Walter Camp invented many of them, including "quarterback." Others, including "halfback" and "fullback," were borrowed from soccer and rugby.
From Wikipedia: "The term quarterback has its origin in Scottish Rugby, wherein backfield players, according to their customary distance behind the forwards, were designated 'quarter back' (i.e. ¼ of the way back), 'halfback', and 'fullback'."
Offence [Quarterback,Fullback,Halfback,Widereceiver,Tightend,OffensiveTackle,Guard, Center] Defence [InsideLinebacker,OutsideLinebacker,DefensiveEnd,DefensiveTackle,Cornerback, FreeSafety,StrongSafety]