Who's the most athletically(elite power, chin and cardio) well rounded boxer in history?

I agree that there's a strong mental element to engine and it can be finetuned with training but even still, there are physical limitations in terms of blood, heart, lungs etc. A sprinter, no matter what his mentality, will never be a good distance runner and that's a big problem in a gruelling fight.

AJ took 14 lbs of bulk off, changed his style to become more conservative and no doubt takes plenty of cardio PED's yet Usyk was fresh as a daisy after 12 rounds of constant movement, feints, slipping and throwing against a much bigger and more powerful man, whereas AJ looked like he was about to have a heart attack, in a fight that wasn't especially punishing and certainly not physical.

 

Chin, power and cardio?

Then it's hard to look past Marciano and Hagler

 

Armstrong, Marciano or Hagler.

 

Sal Sanchez
Saad
Frazier
Langford
Armstrong ( power not so )

 

Holyfield
Hagler
Robinson

 

Hagler is about as complete a fighter as they come. Duran and Leonard deserve mentions as well.

 

Joe Joyce
Homer Simpson level chin
Fit as a butchers dog
Hits like a truck

 

Iron chin

 

Starts and ends with Marvin Hagler

 

He lasted a whole round with the future heavyweight champ

 

So how can he be up there for stamina when did had to protect his legs otherwise he'd cramp up and no way was he draining himself in the beginning of his career dude was barely a adult he hadn't even grown enough to become drained give yourself a talking to in terms of chin and stamina he's way way away from atg

 

How about Harry Greb?

 

Well, idk about stamina but I guess he threw a couple hundred punches a round and won many 15 round decisions.

His resumé is out of this world too

 

He would've lost to all top WWs and Mws in this era.

 

Marciano