Ben Askren explains why he’s choosing to retire from MMA at age 33

After nine undefeated years, the mixed martial arts career of Ben Askren will reach an end on Nov. 24 when Askren looks to defend his ONE welterweight title in his retirement fight against Shinya Aoki at ONE Championship: Immortal Pursuit.While the announcement came as a surprise to many, Askren says the decision to walk away from fighting is one he has long considered, and ultimately, the 33-year-old Olympian — who last week badly outclassed Zebaztian Kadestam to retain his 170-pound titl