A running back ( RB) is a member of the offensive backfield in gridiron football. The primary roles of a running back are to receive handoffs from the quarterback to rush the ball, to line up as a receiver to catch the ball, and block. There are usually one or two running backs on the field for a given play, depending on the offensive formation. A running back may be a halfback (in certain contexts also referred to as a "tailback" — see below), a wingback, or a fullback. A running back will sometimes be called a " feature back" if he is the team's key player/more prominent running back.
With the increase in pass-oriented offenses and single set back formations, it is more common to refer to these players as simply running backs.
In the modern game, an effective halfback must have a blend of both quickness and agility as a runner, as well as sure hands and good vision up-field as a receiver. Quarterbacks depend on halfbacks as a safety valve or checkdown receiver when primary targets downfield are covered or when they are under pressure. Occasionally, halfbacks line up as additional .
When not serving either of these functions, the primary responsibility of a halfback is to aid the offensive linemen in blocking, either to protect the quarterback or another player carrying the football. If a team uses a Wildcat formation, often the halfback—instead of the quarterback—is the one who directly receives the snap. As a trick play, running backs are occasionally used to pass the ball on a halfback option play or halfback pass.
The difference between halfback and tailback is the position of the player in the team's offensive formation. In historical formations, the halfback lined up approximately halfway between the line of scrimmage and the fullback (similarly, quarterbacks lined up a quarter of the distance between the line of scrimmage and the fullback). Because the halfback is usually the team's main ball carrier (while the fullback is primarily a blocker), modern offensive formations have positioned the halfback behind the fullback (at the "tail end" of the formation), to take advantage of the fullback's blocking abilities. As a result, some systems or playbooks will call for a tailback as opposed to a halfback.
In Canadian football, the term tailback is often used interchangeably with running back, while the use of the term halfback is often exclusively reserved for the defensive halfback, which refers to the defensive back halfway between the linebackers and the cornerbacks.
When fullbacks are called upon to carry the ball, the situation typically calls for gaining a short amount of yardage, such as scoring from the goal line, as the fullback can use his bulkiness to avoid being tackled early. While fullbacks do act as an eligible receiver, most plays call for the fullback to remain in the backfield and block any defensive players who make it past the offensive line, a skill referred to as "blitz pickup". Fullbacks are technically running backs, but today the term "running back" is usually used in referring to the halfback or tailback. Although modern fullbacks are rarely used as ball carriers, in previous offensive schemes fullbacks would be the designated ball carriers.
In high school football, where player sizes vary greatly, fullbacks are still frequently used as ball carriers. In high school and college offenses, the triple option scheme uses the fullback as a primary ball carrier. The fullback plays a unique role by establishing an inside running threat on every play. College teams such as Georgia Tech and Air Force have employed the triple option scheme.
While in years past the fullback lined up on the field for almost every offensive play, teams often opt to replace the fullback with an additional wide receiver or a tight end in modern football. Fullbacks in the National Football League today rarely carry or catch the ball, since they are used almost exclusively as blockers. Fullbacks are also still used occasionally as rushers on plays when a short gain is needed for a first-down or touchdown or to surprise the defense since they are usually not expecting a fullback to run or catch the ball. In the past, fullbacks could even be a team's featured back, using their larger size and strength as a "power rusher" to dominate the ground game. Pro Football Hall of Fame members Jim Brown, Marion Motley, Franco Harris, John Riggins, and Larry Csonka were fullbacks.
At the other extreme are "power backs:" bigger, stronger players who can break through tackles using brute strength and raw power. They are usually slower runners compared to other backs, and typically run straight ahead (or "North-and-South" in football terminology) rather than dodging to the outside edges of the playing field. Hall of Famers Earl Campbell, Bronko Nagurski, John Riggins, and Larry Csonka, as well as NFL all-time leading rusher Emmitt Smith, were considered power running backs. Mark Ingram II, Carlos Hyde, Nick Chubb, Kareem Hunt, and Leonard Fournette are all examples of current NFL power running backs.
More recently the NFL has turned to running backs who combine those traits such as Todd Gurley, Ezekiel Elliott, Dalvin Cook, and Saquon Barkley. These backs combine elusiveness with power and patience as well as receiving ability and blocking to become all around, three-down backs.
Christian McCaffrey, is one of few players to have 1000 yards rushing and 1000 yards receiving in the same season in 2019. Some teams have a specialist "third down back", who is skilled at catching passes or better at pass blocking and "picking up the blitz", and thus is often put in the game on third down and long. It can also be used to fool the defense by making them think it is being put into the game for a pass play, when the play is actually a run. James White was used as a third-down back, or as an extra wide receiver. His receiving statistics exceed his rushing statistics, with 3,184 yards and 25 receiving touchdowns on 369 receptions, compared to 1,240 yards and 10 rushing touchdowns on 309 carries.
Analytics departments have also argued that offenses are more successful if they pass the ball more often. Passing plays have consistently averaged more yards than running plays in recent NFL history. Such analysts have argued that this is the case because during running plays, the defensive linemen, linebacking corps, and secondary all have a chance to tackle the ball carrier, but on passing plays, it is possible to effectively eliminate the defensive linemen, linebacking corps, and even the secondary from stopping the play. Furthermore, on passing plays, it is easier to gain additional yards when the ball is delivered to a receiver in open space, but it is not as easy for a running back to make defenders miss. This is especially the case when a running play is designed for the back to run between the tackles, and thus, through the teeth of the defense. Some analysts believe that running the ball is simply a complement to the passing game and will rarely win a team games. These analytical arguments may have also played a role in the NFL's transition from a run-heavy to pass-happy offensive attack.
Because analytics have hinted at what it takes for rushing attacks to thrive, the widespread availability of productive and inexpensive running backs, and the efficiency of the passing offense, they may have served as the impetus for teams' transition to a passing offense and declining need for and valuation of traditional feature running backs.
Despite the rise of committees, "workhorse" running backs are still present, with a recent and prominent example being Derrick Henry of the Tennessee Titans, who, during the 2022 season, took nearly 90% of all of the Titans' carries that season.
On the other hand, several successful teams have survived without distributing significant financial capital towards running backs. In addition to the 2021 Los Angeles Rams, who won Super Bowl LVI in spite of the Gurley contract, the 2022 Kansas City Chiefs won Super Bowl LVII with an offense that finished 20th in rushing but 1st in passing. Seventh-round rookie running back Isiah Pacheco (who overtook the starting job from 2020 first-round selection Clyde Edwards-Helaire due to the latter's injuries and suboptimal production) was Kansas City's primary back during the team's Super Bowl run. Out of the last 14 Super Bowl winners, only five of those teams paid their top rusher a base salary over $1 million, and only one of those five paid its top rusher a base salary of over $2 million, thus proving that a highly paid running back is not essential for winning.
Other examples of lucrative, long-term contracts given to running backs that backfired on teams include those given to Le'Veon Bell (4-year contract for $52.5 million, cut during year 2 of contract), Ezekiel Elliott (6-year extension for $90 million, cut after year 2 of extension), and David Johnson (3-year extension for $39 million, traded after year 1 of extension).
As teams have become more analytically inclined, they have not used their first round draft picks on running backs nearly as much as they used to. For example, from 1981 to 1985, more than half of all lead running backs were selected in the first round of the draft, but from 2016 to the present, that figure dipped to just over a quarter of all lead running backs. In fact, during the 2022 NFL draft, not a single running back was selected in the first round. The following year, when the Atlanta Falcons used the eighth overall pick to select running back Bijan Robinson, several analysts heavily criticized the Falcons and argued that they could have used the pick to fulfill another need and selected a productive running back in the later rounds. The Detroit Lions faced similar backlash for taking running back Jahmyr Gibbs with the twelfth overall pick in the 2023 NFL draft. Gibbs was considered a questionable pick because analysts felt that the pick could have been put to better use even with the known talent that Gibbs offered.
Despite the widespread criticism of drafting running backs in the first round, some observers have defended the practice if done in the right circumstances. For example, some writers defended the selection of Robinson in the first round due to his versatility and contributions to the passing attack while he was in college.
In recent years, NFL teams have shown that they are willing to move on from productive running backs once they are due for a big payday and instead replicate their production by taking advantage of cheaper alternatives such as their own backups, mid to late round draft picks, and low-risk free agent running backs. For example, during the 2023 NFL offseason, feature running backs Dalvin Cook, Ezekiel Elliott, Leonard Fournette, and Kareem Hunt, despite enjoying productive careers up to that point, were either released by the respective teams that they previously played for or allowed to leave during free agency. As of July 18, 2023 (the beginning of training camp for several NFL teams), the four aforementioned unemployed running backs have remained as such. Other productive running backs such as Las Vegas Raiders starting running back Josh Jacobs, New York Giants starting running back Saquon Barkley, and Dallas Cowboys backup running back Tony Pollard were franchise tagged by their respective teams during the 2023 offseason. The three aforementioned backs failed to agree to a long-term deal by the July 17 deadline. As of July 18, 2023, only Pollard has signed his franchise tender, while Barkley and Jacobs have yet to sign their tenders (Barkley would later agree to a separate one-year deal worth up to $11 million with the Giants on July 25, and Jacobs would later agree to a separate one-year deal worth up to $12 million with the Raiders on August 26). In other cases, productive running backs have accepted pay cuts due to a lack of leverage and/or the desire to contribute to teams. For example, Cincinnati Bengals feature back Joe Mixon took a pay cut before the 2023 season despite boasting a productive career resume to that point.
Due to the decline in value of running back contracts and the prolonged periods in which previously productive running backs (e.g. Elliott, Cook, Hunt, and Fournette) have remained unemployed, several running backs, such as Tennessee Titans running back Derrick Henry, have spoken out about the state of the running back market in 2023 and complained that running backs have not been provided with fair compensation for the services they provide.
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