You need to qualify those types of statements. What makes them stronger, faster, and better conditioned. Don't just say improved training etc. or use other sports as an example, explain them. I'd say nutrition, and styles/training may have improved/changed slightly, but not enough to make that much of a dramatic difference in boxing.
Also, if they have changed that much, wouldn't the fighters of the past, if fighting today (ie. a mythical match-up against Pavlik), have all those improved methods available to them?
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