Freddie Roach was diagnosed with Parkinson's disease a few years after Ali

You may know Freddie Roach as one of the most famous trainers in boxing history. The trainer and former professional boxer was diagnosed with Parkinson's in 2010 when he was just 42 years old. He now manages his symptoms with medication and continues to work as a trainer at the world-famous Wild Card Boxing Club in Hollywood. Some of the people he's trained are Amir Khan, Manny Pacquiao, Mark Wahlberg, and Georges St. Pierre. In an interview with CBS, Roach commented, "I'm in the gym every day, it's part of life. Instead of taking a vacation, I like what I do. My vacations are right here."

Photo source: Bryan Horowitz