No, Willie Parker was an offensive player. He was an NFL running back.
No higher than the ankles
That was running back Curtis Martin of the New England Patriots.
A running back is the player on the offense of a football team who is usually running the ball.
quarterback, running back, wide recievers, Offensive tackles (2), offensive guards (2), and center
No they are totally different. The Quarterback is the player who throws/hands off the ball. The Running Back is the player who takes the ball from the Quarterback.
To carry the football forward in pursuit of an offensive score
When the offensive team breaks the huddle and comes up to the line of scrimmage to start the play, the first offensive player to touch the ball is the center. The center snaps the ball to the quarterback and the quarterback will either hand the ball to a running back, throw the ball to a receiver, or run the ball himself.
running back,quarterback,offensive lineman,wide receiver,tight end,full back
Jonathan Dwyer is the running back for the Arizona Cardinals. He is a football player.
Technically, under NFHS rules hurdling another player is illegal, though the foul is rarely called. Having said that... um, no, there are no rules that specifically dictate "how high a running back can jump." Presumably the limitations presented by gravity are sufficient.