What made Marciano punch so hard?

He was a fine little attrition puncher. His greatest asset was his stamina and strength. He wasn't the hardest one-shot guy, even for his weight, but he never stopped coming and was able to throw hard throughout the fight, no breaks, never looking for a timeout, ever looking to the ref or his corner. He ground down his opponents 180 seconds a round. Even a highlight reel KO like Walcott was set up by breaking down Walcott through pace, pressure and power over a dozen rounds. You can see Walcott's legs and reflexes withering over the latter rounds, setting him up for that final shot (well, two shots) as he came off the ropes.

 

Mama Mia, that’s a spicy meatball!

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I like that. That guy could punch through a wall.

 

That's the last ingredient to add to Greg's. Genetics.

 

Punch mechanics. He optimised his punch technique to get the most power in his hooks. He really turns his body into the shots. He is not the kind of guy who you will see throwing a jab. It's extremely hard hooks from first round to last. It's not a textbook technique. It's not really the kind of thing you would see fighters doing today. Marciano trained himself on what worked best for him. It was a truly unique style and only made possible that it would work by him having non stop heavy power all night. You couldn't get anywhere with that style if you weren't a premier puncher. He trained with very heavy bags and just pounded it relentlessly. I wouldn't be surprised if he was throwing upward of 3000 power punches a day on that bag, along with his other conditioning work.

 

Bisketti supplements.

 

He was born.

 

One thing that Marciano did that Angelo Dundee saw is when he worked the heavy bag Rocky would do a squat and come out of it punching. He would do it over and over.
His conditioning and some power in his lower body. Also being in supreme condition allowed him to carry his power all nite long.