Big George Foreman

The director Geroge Tillman Jr didn't want to use a fat suit or visual effects in order to show the transformation Foreman went through from his prime to when he came out of retirement to return to boxing in his forties. The filming was split into two blocks; first to shoot scenes where Foreman is at his prime and later for when he's in his forties. The crew took six weeks off so Khris Davis could bulk up for the latter part of the filming. Davis had pretty strict instructions on how many calories to eat per day, depending on his training regime, but the actor went above and beyond, consuming 7000 calories a day to gain the necessary weight. He went from 225 to 275 in six weeks eventually ending up at around 282.

Angelo Dundee is shown suggesting to throw in the towel before round ten. In actual fact he was filmed on camera telling George that to win he needed to knock out Moorer and that the time was now, which Foreman proceeded to do.