Source: FOX Sports: Beyond The Glory Joe Frazier
Joe Frazier was called Smokin' Joe Frazier, but I call him Iron Joe Frazier, even though Mike Tyson now owns that nickname, but that is exactly what Joe was. He came from a generation before Iron Mike. But Joe Frazier had that iron face, neck, head, and hands. He descended from sharecroppers in South Carolina and made it up to Philadelphia, where he learned how to box in the 1960s. He was an Olympic champion at the 1964 Summer Olympics.
Joe Frazier had an iron body and came from a hard-scrabble environment that gave him an iron mentality. No one was going to stop him. I believe that is what primarily contributed to Joe Frazier's style as a boxer. He would close off the ring, especially against tall fighters, and you have to know that Joe Frazier was 5'10," if that. Joe did cut off the ring and went right at you and dared you to stop him.
Joe Fraizer had an iron face and neck to go along with iron fists, and when he hit you, he broke bones and dared you to hit him back, and what you had to do was to basically try to kill him before he killed you. Which is what Muhammad Ali did to him in Ali-Frazier III and what George Foreman did to him when he beat him for the World Heavyweight Championship in 1973: punch Joe as hard as you could over and over to prevent him from hitting you.