ok firstly; are you really comparing boxers of 50-100 years ago to **** erectus?
secondly the evolution of a train has happened over 100 years so of course they have improved quickly humans have been evolving since life began millions of years ago our improvements are tiny and barely significant
i will agree with anyone saying that on average boxers nowadays are stronger and bigger than they were 'back inthe day' this is because they focus on beefing up for power and because they have a superior diet. ( higher in protein and energy giving them plenty of protein to be able grow)
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