A line is quickly forming of potential opponents for 'Iron' Mike Tyson after the 53-year-old retired boxer shared an incredible workout video capped off with the comment "I'm back!"
Tyson hopes a series of exhibition fights will help raise money for those dealing with homelessness and drug addiction.
CBS Sports reports the list includes former Tyson rival Evander Holyfield, New Zealand rugby star Sonny Bill Williams and even Tyson Fury's dad, John, a 55-year-old former boxer himself, who issued his challenge Thursday on Instagram saying, "I don't value my life at 50 [pounds] but let me tell you something, Mike Tyson is worth doing charity with."