Question:  Tobin Bo Gunnar Gerhart held the Stanford record for most rushing yards in a season until the record was broke by an American football running back holds the NCAA record for what?

Context paragraphs:
Jamie Morris: James Walter Morris (born June 6, 1965) is a former professional American football running back in the National Football League (NFL) for the Washington Redskins and a record-setting running back in college for the University of Michigan Wolverines.  While attending Michigan, he broke the school's all-time records for rushing yards in a season and in a career and for all-purpose yards in a career.  His career rushing total was once third in Big Ten Conference history.  He continues to hold the career receptions record for Michigan running backs.  He also still holds the all-time NFL record for most rushing attempts in a game with 45.

Fred Wendt: Fred Wendt (born c. 1927) was an American football player.  He played college football for the UTEP Miners football team.  He led the NCAA major colleges in rushing yardage with 1,570 rushing yards in 1948.  His total of 1,570 rushing yards in 1948 broke the national collegiate rushing record of 1,281 yards set by Rudy Mobley in 1942.  Wendt's rushing record stood for 20 years until broken in 1968 by O. J. Simpson.  Wendt also broke the NCAA single-season scoring record with 152 points in 10 games, including 32 place-kicking points.  He did not play during the 1949 season due to a leg injury and was signed by the Chicago Cardinals of the National Football League in April 1950.

Derrick Henry: Derrick Henry (born July 17, 1994) is an American football running back for the Tennessee Titans of the National Football League (NFL).  He played college football for the Alabama Crimson Tide, and was drafted in the second round of the 2016 NFL draft by the Titans.  In December 2015, he broke Herschel Walker's single season college rushing yards record in the SEC.  He won the 2015 Heisman Trophy, as well as the Doak Walker Award, the Maxwell Award, and the Walter Camp Award.  Henry also holds the national high school football record for career rushing yards.

Christian McCaffrey: Christian Jackson McCaffrey (born June 7, 1996) is an American football running back for the Carolina Panthers of the National Football League (NFL).  He played college football at Stanford, and was drafted by the Panthers with the eighth overall pick in the 2017 NFL Draft.  As a sophomore in 2015, McCaffrey was the AP College Football Player of the Year and the runner-up for the Heisman Trophy.  He holds the NCAA record for most all-purpose yards in a season with 3,864.  He is the son of former Stanford and NFL wide receiver Ed McCaffrey and former Stanford soccer star Lisa McCaffrey, who is the daughter of U.S. Olympian Dave Sime.

2,000-yard club: The 2,000-yard club is a group of seven National Football League (NFL) running backs that have rushed for 2,000 or more yards in a season.  These seven rushing seasons rank as the highest single-season rushing totals in NFL history, and reaching the 2,000-yard mark is considered a significant achievement for running backs.  No running back has yet achieved this feat twice.  The first 2,000-yard season was recorded in 1973 by Buffalo Bills running back O.J. Simpson.  He is the only player to have surpassed 2,000 yards in a 14-game season, as all others occurred in 16-game seasons; he finished the season with 2,003 rushing yards, averaging six yards per carry and an NFL-record 143.1 rushing yards per game.  Los Angeles Rams running back Eric Dickerson, who had broken the single-season rookie rushing record in 1983, recorded the second 2,000-yard season in 1984.  Dickerson rushed for 2,105 yards, the current NFL rushing record, and averaged 131.6 rushing yards per game.

Billy Marek: Billy Marek (born c. 1954) is a former American football running back.  He played college football for the University of Wisconsin–Madison from 1972 to 1975.  He gained more than 1,200 rushing yards for three consecutive years from 1973 to 1975.  He concluded his college football career with 740 yards and 13 touchdowns in the final three games of the 1974 season, including a Wisconsin Badgers football record 304 rushing yards against Minnesota.  He also set Wisconsin career records with 3,709 rushing yards and 277 points scored, led the country with 114 points in 1974, and was named the State of Wisconsin's "Sports Personality of the Year" in 1974.  He was inducted into the University of Wisconsin Hall of Fame in 1994.

Butch Woolfolk: Harold E. "Butch" Woolfolk (born March 1, 1960) is a former American football running back and kick returner who played in college for the University of Michigan (1978–1981) and in the National Football League (NFL) for the New York Giants (1982–1984), Houston Oilers (1985–1986) and Detroit Lions (1987–1988).  Woolfolk attended Westfield Senior High School in Westfield, New Jersey.  Woolfolk led Michigan in rushing three straight years and set the school record with 3,850 rushing yards while playing for the Wolverines from 1978 to 1981.  As a sophomore in 1979, he was the Big Ten Conference scoring champion, and he went on to become a three-time first-team All-Big Ten selection.  He had his best season as a senior at Michigan, winning the 1981 Big Ten rushing title and falling just 10 yards short of Rob Lytle's single-season rushing yards record.  He was also selected in 1981 as the Most Valuable Player of both the Rose Bowl played January 1, 1981, and the Bluebonnet Bowl played December 31, 1981, as well as the Wolverines' team MVP for the season.

Thomas Rawls: Thomas Rawls (born August 3, 1993) is an American football running back for the Seattle Seahawks of the National Football League (NFL).  He was signed by the Seahawks as an undrafted free agent in 2015.  He played college football at Michigan and Central Michigan.  Rawls currently holds the Seahawks' record for the most single game rushing yards by a rookie running back (209) and the most rushing yards by an undrafted rookie in his first 6 games (711).  He also holds the Seahawks' record for most yards in a postseason game (161), accomplished on January 7, 2017 in the wildcard round versus the Detroit Lions.

Toby Gerhart: Tobin Bo Gunnar Gerhart (born March 28, 1987) is an American football running back who is currently a free agent.  He was selected by the Minnesota Vikings in the second round of the 2010 NFL Draft.  He played college football for Stanford University, and was a unanimous All-American.  In 2009 Gerhart won the Doak Walker Award and was the runner-up for the 2009 Heisman Trophy.  He received 1,276 points in the Heisman voting, coming in second to Mark Ingram Jr., who received 1,304 points; the 28-point margin was the closest vote in Heisman history.  Gerhart had a breakout senior season in 2009, leading all running backs in the nation in rushing yards, touchdowns, and points scored, and setting several Pac-10 and school records.  He held the Stanford record for most rushing yards in a season (1,871) until Christian McCaffrey broke it in 2015, but still holds Cardinal records for touchdowns in a season (28), and most touchdowns in a career (44).

Vincent Alexander: Vincent Leon Alexander (born March 11, 1964 in St. Tammany, Louisiana) is a former professional American football running back in the National Football League.  He would play with the New Orleans Saints in 1987.  He played college football for the University of Southern Mississippi from 1983 to 1986.  As a freshman, he gained 153 rushing yards in his first start.  He also returned the opening kickoff 96 yards for a touchdown against the Alabama Crimson Tide in November 1983.  He gained 551 rushing yards in 1983, 572 in 1984, 847 yards in 1985, and 668 yards in 1986.  He was the leading rusher for Southern Mississippi for three consecutive years from 1984 to 1986.

Supporting paragraphs: Toby Gerhart Christian McCaffrey
Answer: most all-purpose yards in a season