The size of heart can be changed through stamina training. When i was about 17 my doctor diagnosed my heart to not have grown as much as the rest of my body through poverty and that i should run more to train it. So, i additionally to my normal sports - football, okay soccer :hey , karate - i started to run every day through the woods. After about 8 month i had the same test and my heart was slightly above average sized for a man my age and size. So, i assume that everybody who parcipitates at sport in whicht stamina plays a big part has a heart that has a size above average.
Joe Calzaghe, Joe Frazier, Carlos Monzon. Never saw these guys tired and they constantly threw punches and over long distance fights. Road work a big factor in this. Monzon - 45 minutes a day. Calzaghe - 6 miles. Frazier - 5 to 7 miles
Matthew Saad Muhammad and Danny Lopez are two fighters who never tired in any fight of theirs that I have seen.
Thank you! Sal would sit on his stool between rounds, looking like he's waiting for Round 1 to start and not Round 15. Sal's stamina was more impressive than that of a Frazier or Marciano to me, as beastly as theirs were.
Yeah, he had a good stamina, but let´s not forget, he had a at the best mediocre pace (history-wise compared to the bests like Armstrong, Greb, etc.), I would like to see if he fights someone like Margarito (where he would need to throw more punches), if he has still the same stamina at the later rounds like usually...
Mayweather fought Hatton who averages 80punches a round, Chavez who averaged 100punches a round and plenty of other pressure fighters Mayweather has excellent stamina but he doesnt show a massive workrate to display amazing endurance.
Frazier in Manilla. Had it not been for the compassion and good call on Futch's part Joe was all up for starting the 15th round, at least in his mind.
Here are somefighters who were great in the late rounds: Matthew Saad Mohammad Eusebio Pedroza Salvador Sanchez Sauol Mamby Aaron Pryor Larry Holmes Alexis Arguello