I think the key issue is amazing timing and extremely unusual angles. A perfect example was his screw shot, which came unpredictibly and right through his opponent's guard. If the boxer can't brace for it/role with the punch, he's getting hit flush, and that's where you get knocked out.
- explosive muscle fibers are the ones that can contract a lot in a very short amount of time to produce explosive power... some people are born with more than others... and you can develop the ones that you are born with - elastic tendons and muscle tissue allow you to pre-stretch the muscle more than other people which allows you to contract the muscle more powerfully. You can do stretching exercises to make them more elastic - fast rate of muscle recruitment means you have a very efficient nervous system that allows you to trigger individual fiber contractions at a faster rate than other people. This can also be trained more efficiently - eccentric to concentric means before you contract your muscles, you want to lengthen (pre-stretch) them first to get a better contraction, like when you dip before taking a jump. Also, you want to go from eccentric (lengthening) to concentric (shortening) as quickly as possible in boxing as opposed to maybe a shotputter who dips (pre-stretches) longer and takes a bit longer to change direction to contracting.
:good Thanks a million times. But it seems to me that the only one that's mostly genetic is explosive muscle fibers, all the others you can improve through exercise so I am guessing this component is very important as it's the difference in power for most people. Also, you said you can develop the ones you were born with, do you mean by plyometric training? And my final question, I noticed a lot of times guys who have abnormal( and I mean VERY abnormal) punching power seem to have arms that seemed to be made of bricks. I know that it kinda sounds weird but when they throw a punch and I catch it, it seems as if my arm flies away. Is this the elastic tendons and muscle tissue that allows them to contract their muscles better?
It's not exactly explosive muscle fibres. It's individual fibres that can contrat at a faster rate to produce many more simultaneous individual contractions which add up to a stronger muscle. The explosiveness would then depend on the other factors which different people are endowed with in different amounts at birth. That's one method. Repetetive motor training is another. Flexibility. Negative resistance training also. Sounds like better locking technique and stepping on the punch.