Apparently, a lot of boxing trainers say that punching power is genetic, that either you have it or you don't. This confused me to no end, any thoughts or explanations on why someone would say that?

I don't know if that is correct but it could be another way of saying that some boxers instinctively use whole body power while others never figured it out (knowingly or not) and are not taught it.

I understand that speed uses one type of muscle fiber while lifting strength uses another type and people are naturally predispositioned for one or the other. Perhaps good punchers are born with both(?).

I don't think most boxing trainers would say the average person couldn't improve his punching power to a certain extent, only that a select few genetically gifted will have the potential to be world class punchers.

The article I read about the muscle fibers said that scientists discovered you could change their speed-or-strength focus through training. When you think about that, it's a no-brainer.

As well as being a daoist I happen to be a sports scientist (strange combo I know). Fast twitch mucsle fibres and slow twitch muscle fibres are two types that are recruited when we use our stength. They burn through different types of fuel more efficiently some use Glycolysis (oxygen system) some ATP/PC (no oxygen). Some people because of genetics can recruite more of the fibres need for ATP/PC system so can be better sprinters etc. However science does not have answers for how some people can manifest enormous strength out of seemingly nowhere. They grudgingly put it down to Nural receptors and motor functions. CHI is energy of the Neural kind not easily measured by science. Ging is the ability to use chi as well as local muscle power to produce force. Internal Masters are able to teach the smallest of people to generate force which by simple muscle fibres they should not be able to generate.

You should go back to school.

Can I go to the same school as you?

No. You brain might explode.

..really...i always thought that glycolysis was only a part of the ATP/ADP thing that was aerobic respiration and anarobic repiration was the one that required no oxygen (but still uses ATP/ADP)...

Yes aerobic work still uses ATP it is the breaking of one molecule of phosphate that creates energy used for work. It is how the ADP is turned back into ATP for muscle work that differs. To explain the differences and similarities in the systems would require a number of pages and would be very boring to people who are not interested in sports physiology. I was trying to make the point that stength is not only put down to muscle fibres.