Is it true muscles makes your stamina bad ? If so why ?

Muscles suck a lot of oxygen when used and can be heavy if the person is not naturally muscular

It's not necessary being "muscular" it's being bigger than you should be naturally The bigger you are the more blood your heart has to pump around your body when you are physically active, if you are a naturally slim guy whos bulked up and put a load of muscle on your heart won't be able to do that as easily as someone who is just naturally big

It's like most subjects relating to the body, it comes down to conditioning. Large muscles that haven't been conditioned for a high work rate will fatigue when pushed. Lactic acid will build up, making them heavy and burn. But muscles that have been conditioned for a higher work rate may be resistant to rapid fatigue. As for overall endurance, aerobic conditioning is key. In my younger days when I played basketball alternately with weightlifting, my endurance was pretty high. But as I began to focus more on lifting and less on playing ball, I noticed that my endurance dropped significantly. I'd get winded walking up a flight of stairs or laying pipe in my wife. Once I started working in aerobics again on the stair climber, I got my wind back,

Anthony Joshua has never lost a fight due to his endurance levels, and in his two fight vs Oleksandr Uysk I & II 'he actually manage the pace of the fights better than Tyson Fury. Oleksandr Uysk also in his two fights vs Joshua, had to produce a higher work rate in order to beat Joshua'. I know? Certain folk don't like putting in effort being original, or analyzing actual boxing fights. It is a complete and utter myth that Anthony Joshua has bad endurance levels, especially compared to most of his nearest competition during this heavyweight era'. By no means, I am claiming that Anthony Joshua has the best endurance levels in the heavyweight divisions, but? For sure he has never lost a fight due to his endurance levels, in comparisons to his nearest competition throughout his entire career. He has always been able to compete with those fighters, in this area of his game. Oleksandr Uysk has been really the only heavyweight fighter in my opinion, who Joshua has faced that had superior levels of endurance. And to his credit Wladimir Kiltschko would have been very close with Joshua in this area of his game'. I wonder why you did not mention Daniel Dubois in your post in this thread, that would have been a more viable response to the thread starter. In all of his fights which he has lost, he has been done by the middle rounds 'especially in the case with his fights against Oleksandr Uysk I & II'. Note: Here are some statistics for you below, which pretty much display and prove Anthony Joshua's skill for skill boxing ability 'And that he has a fairly solid level of endurance'. Workrate produced:Over the 48 rounds of action vs Tyson Fury and Anthony Joshua. Anthony Joshua over his two fights with Uysk, his work rate superior to Tyson Fury's 'Joshua threw 641 punches in the first fight, and then 492 punches in the rematch. Joshua's second fight with Uysk, showed that tactically? He was attempting to manage his pace more efficiently, which he did. But Uysk in response to this threw 712 punches. Out of all 4 Heavyweight titles fights vs both Fury and Joshua, Oleksandr Uysk produced his highest work rate vs Anthony Joshua II'. Anthony Joshua vs Oleksandr Uysk II 'I personally regard that fight, as the absolute peak version of Uysk. Uysk vs Joshua II was throwing on average 300 + more punches than he did vs Tyson Fury I & II. Punches landed: Over the 48 rounds of action vs Tyson Fury and Anthony'. And people need to factor this in? The highest amount of punches, Uysk landed on Anthony Joshua 'Was during their rematch. 170 Punches. The highest amount of punches Uysk landed on Tyson Fury, was 179 punches during their rematch. Oleksandr Uysk was also able to land 170 punches on Tyson Fury in their first fight. While Oleksandr Uysk was able to land a total of 148 punches on Anthony Joshua during their first fight'. Tyson Fury during his first fight against Oleksandr Uysk landed a total of 157 punches, and during the rematch he landed 144 punches. Anthony Joshua during his first fight against Oleksandr Uysk landed a total of 123 punches, and during their rematch landed a total of 124 punches'. Note: The statistics of the fight action from all four fights, showed that Oleksandr Uysk in order to beat Anthony Joshua twice back to back 'had to produce a greater effort, than he did up against Tyson Fury in their fights. Uysk had to produce a higher work rate against Joshua, in order to land a similar amount of punches that he did on Tyson Fury'. The only area of the 48 round of action where Tyson Fury did better than Anthony Joshua 'Was being able to land more punches. That is it. But in all other areas of boxing, Anthony Joshua actually fought a better fight twice back to back than Tyson Fury. The statistics of the fight action, show there is hardcore evidence to back up this observation and opinion of mine'. Note: To the thread starter? Muscles can hinder performance, if the mass a fighter gains is non-functional muscle mass i.e. muscle mass that has not been conditioned, and the fighter has just basically used body building tactics to increase their weight. I have observed and analysed the sport of body building to a certain extent, I admired the 70s', 80's and 90's body building eras. When it comes to gaining information and insights on how to structure training programs, and understand what is actually happening to your body physiologically during training. And how to recover from training sessions, then body building as a sport can learn people in all sports a lot in my opinion'. But let's not make no mistake about this? Body builders are not performance athletes primarily; their primary game is not about functional strength or maximum performance. And this is where boxers at times can make mistakes, they gain mass but it is not always functional mass. When Deontay Wilder fought Tyson Fury for the third time, he clearly was not as functional weighing in at his career heaviest of 238 pounds'. Usain Bolt from the start of his professional track and field career, to his peak? Gained more mass and became a better athlete, because he increased his functional muscle mass 'because Track and Field athletics is a performance based sport. Just like boxing'. To conclude: Fighters like Anthony Joshua and Oleksandr Uysk, are very meticulous trainers 'everything they do has a purposed and has most likely been analyzed in extreme detail. Uysk has gained mass as a heavyweight fighter, but his endurance is still very impressive even during the latter stages of his career'. The best Cruiserweight version of Oleksandr Uysk, does not beat any version of Oleksandr Uysk as a heavyweight fighter 'Uysk as a fighter, is too strong and his endurance levels are still super impressive. That is because he has gained functional muscle mass as a Heavyweight fighter' etc. quite an impressive essay ill finish it by early 2026 but im only just referring to AJ himself straight from the horses mouth "I'm not a 12-round fighter. Look at me. I'm a new breed of heavyweights...because I ain't 14 stone, I'm 18 stone and I'm heavy. It's hard work"

ask AJ about this one Anthony Joshua has never lost a fight due to his endurance levels, and in his two fight vs Oleksandr Uysk I & II 'he actually manage the pace of the fights better than Tyson Fury. Oleksandr Uysk also in his two fights vs Joshua, had to produce a higher work rate in order to beat Joshua'. I know? Certain folk don't like putting in effort being original, or analyzing actual boxing fights. It is a complete and utter myth that Anthony Joshua has bad endurance levels, especially compared to most of his nearest competition during this heavyweight era'. By no means, I am claiming that Anthony Joshua has the best endurance levels in the heavyweight divisions, but? For sure he has never lost a fight due to his endurance levels, in comparisons to his nearest competition throughout his entire career. He has always been able to compete with those fighters, in this area of his game. Oleksandr Uysk has been really the only heavyweight fighter in my opinion, who Joshua has faced that had superior levels of endurance. And to his credit Wladimir Kiltschko would have been very close with Joshua in this area of his game'. I wonder why you did not mention Daniel Dubois in your post in this thread, that would have been a more viable response to the thread starter. In all of his fights which he has lost, he has been done by the middle rounds 'especially in the case with his fights against Oleksandr Uysk I & II'. Note: Here are some statistics for you below, which pretty much display and prove Anthony Joshua's skill for skill boxing ability 'And that he has a fairly solid level of endurance'. Workrate produced:Over the 48 rounds of action vs Tyson Fury and Anthony Joshua. Anthony Joshua over his two fights with Uysk, his work rate superior to Tyson Fury's 'Joshua threw 641 punches in the first fight, and then 492 punches in the rematch. Joshua's second fight with Uysk, showed that tactically? He was attempting to manage his pace more efficiently, which he did. But Uysk in response to this threw 712 punches. Out of all 4 Heavyweight titles fights vs both Fury and Joshua, Oleksandr Uysk produced his highest work rate vs Anthony Joshua II'. Anthony Joshua vs Oleksandr Uysk II 'I personally regard that fight, as the absolute peak version of Uysk. Uysk vs Joshua II was throwing on average 300 + more punches than he did vs Tyson Fury I & II. Punches landed: Over the 48 rounds of action vs Tyson Fury and Anthony'. And people need to factor this in? The highest amount of punches, Uysk landed on Anthony Joshua 'Was during their rematch. 170 Punches. The highest amount of punches Uysk landed on Tyson Fury, was 179 punches during their rematch. Oleksandr Uysk was also able to land 170 punches on Tyson Fury in their first fight. While Oleksandr Uysk was able to land a total of 148 punches on Anthony Joshua during their first fight'. Tyson Fury during his first fight against Oleksandr Uysk landed a total of 157 punches, and during the rematch he landed 144 punches. Anthony Joshua during his first fight against Oleksandr Uysk landed a total of 123 punches, and during their rematch landed a total of 124 punches'. Note: The statistics of the fight action from all four fights, showed that Oleksandr Uysk in order to beat Anthony Joshua twice back to back 'had to produce a greater effort, than he did up against Tyson Fury in their fights. Uysk had to produce a higher work rate against Joshua, in order to land a similar amount of punches that he did on Tyson Fury'. The only area of the 48 round of action where Tyson Fury did better than Anthony Joshua 'Was being able to land more punches. That is it. But in all other areas of boxing, Anthony Joshua actually fought a better fight twice back to back than Tyson Fury. The statistics of the fight action, show there is hardcore evidence to back up this observation and opinion of mine'. Note: To the thread starter? Muscles can hinder performance, if the mass a fighter gains is non-functional muscle mass i.e. muscle mass that has not been conditioned, and the fighter has just basically used body building tactics to increase their weight. I have observed and analysed the sport of body building to a certain extent, I admired the 70s', 80's and 90's body building eras. When it comes to gaining information and insights on how to structure training programs, and understand what is actually happening to your body physiologically during training. And how to recover from training sessions, then body building as a sport can learn people in all sports a lot in my opinion'. But let's not make no mistake about this? Body builders are not performance athletes primarily; their primary game is not about functional strength or maximum performance. And this is where boxers at times can make mistakes, they gain mass but it is not always functional mass. When Deontay Wilder fought Tyson Fury for the third time, he clearly was not as functional weighing in at his career heaviest of 238 pounds'. Usain Bolt from the start of his professional track and field career, to his peak? Gained more mass and became a better athlete, because he increased his functional muscle mass 'because Track and Field athletics is a performance based sport. Just like boxing'. To conclude: Fighters like Anthony Joshua and Oleksandr Uysk, are very meticulous trainers 'everything they do has a purposed and has most likely been analyzed in extreme detail. Uysk has gained mass as a heavyweight fighter, but his endurance is still very impressive even during the latter stages of his career'. The best Cruiserweight version of Oleksandr Uysk, does not beat any version of Oleksandr Uysk as a heavyweight fighter 'Uysk as a fighter, is too strong and his endurance levels are still super impressive. That is because he has gained functional muscle mass as a Heavyweight fighter' etc.

ask AJ about this one

Theoretically, at least, more muscle tissue requires more oxygen to power. You never see someone with large muscles excel at stamina-based activities. Athletes like Bradley, mentioned above, don’t have really large muscles. In Tim’s case, he had very little body fat, which gives the illusion of larger muscles. He was also blessed with good genes for muscular development. Might’ve had a career in bodybuilding.

I'm not sure I would include Wladimir. Wasn't he notorious for falling apart later half of the fights if he didn't pace himself properly? Look at Tim Bradley. He was also very defined and had a pretty good gas tank (yet very little pop). I think it has to do with the amount of elasticity a fighter whose body is built muscular has. Just Google it up and see what that's all about because I don't care to explain here, lol. Though one key element that probably answers your question is this part, Improved efficiency: The ability to store and release energy means muscles don't have to work as hard on every movement, improving overall efficiency. So if you are lacking the elasticity, your muscles will have to work harder, thus tiring you out sooner.