5 oldest people to step into an MMA fight

#2 Herschel Walker

Walker's daily fitness regimen since high school consists of 1500 push-ups and 2500 sit-ups

If there was a list of the best pure athletes in the history of professional sport, Herschel Walker would easily make the top 10. He overcame weight issues and a speech impediment to become a track and field star with astonishing speed.

His singular athleticism would prove formidable on the football field and in 1980, he was the most sought after high school player going into college.

Walker would show everyone exactly why, by winning the Heisman Trophy (awarded to the best college football player in America) in 1982. He was snapped up by the New Jersey Generals of the United States Football League before he graduated and in 1985, was drafted by the Dallas Cowboys.

Walker enjoyed his greatest success in the NFL with the Cowboys, who exploited his blinding speed and shaped a lot of their offence around him. In 1989, at his peak, Walker was traded to the Minnesota Vikings in exchange for five players, a move which would prove ill-fated for him.

Bad tactics and underutilisation would plague his tenure there, and Walker actually left the NFL to represent the USA in bobsled racing in the 1992 Winter Olympics.

He returned later in 1992 to play for the Philadelphia Eagles, then the New York Giants in 1995 and finished his career in 1997, with the team he began with, the Dallas Cowboys.

In 2009, Walker was signed to Strikeforce's Heavyweight division and began training at the American Kickboxing Academy. In his debut on January 30, 2010, a 47-year-old Walker, down on the scorecards, defeated 27-year-old Greg Nagy by 3rd round technical knockout. A year later, he beat Scott Carson by TKO, this time in the first round.