Rare behind-the-scenes photos show Muhammad Ali training for one of his most historic fights
Simon wasn't sure what to expect. "I had never been to a boxer's training camp," he wrote in the intro to his upcoming book "Muhammad Ali: Fighter's Heaven 1974." It's an especially timely piece given Ali's passing June 3.
"While a global audience was fixated on his fate, I was able to record aspects of Ali virtually unknown," Simon said in a press release for the book. Ahead, see some of the intimate moments Simon captured of one of the world's most famous boxers.