To all those who are saying boxers (HW or not) don't need to run for miles to increase stamina.... then i would ask them name me one boxer who is known for their stamina e.g. Calzaghe, Mayweather, Margarito, Paul Williams, Froch, Pacquiao etc.... who don't do roadwork/run for miles?? all elite boxers known for their stamina do roadwork.... Haye on the other hand is more explosive but lacks stamina....his last fight didn't prove a thing in terms of stamina....as you could count the number of punches he threw per round on one hand....and he was fighting a lumbering giant who never even leant on him once
I will say this... many are starting to do less running but add swimming to the workout..... less stress on the ankles, kness and back and is actually a better cardio workout.....