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Rocky Marciano, for example, embodied this ethos by running seven miles a day in army boots, putting immense strain on his legs. He coupled this with physical labor, such as chopping wood, as a belief that it would enhance the power behind his punches. Roberto Duran mirrored this philosophy, often enduring hundreds of sparring rounds without breaks, pushing both his limits and those of his opponents.
Their approach to training was raw, brutal, and above all focused on building resilient bodies capable of enduring long fights, often lasting up to 15 rounds. Modern fighters, in contrast, are more efficiency-oriented, utilizing advanced science to maximize both health and performance.