Originally Posted by Asterion
If properly trained, most. It's just that all of the elite heavyweights now train for 12-round fights (and then you have a percentage of lazy ****s who get tired).
Well that's kind of the point, most don't train for proper stamina and want to rely on size. The last big heavy I saw go 12 hard rounds was Bowe in the first Holyfield fight and that was really the only time he did it. Lewis did 10 against Mercer, but his fights with Holy, while competitive really weren't that gruelling.