Not talking about the strength of connections (resulting from.. say repetitive rigorous planche training) but the variety of connections, meaning that every new skill learned/practiced (even non-physical one, such as math)
ultimately increases the max capacity of the central nervous system signal, which leads to more muscle recruitment in exercises.
In essence, I'm trying to figure out what affects the max strength capacity of the brain's signal besides the obvious conscious intention of the person. any book on the topic would be much appreciated
edit:
To illustrate, take bruce lee for example, when he punches/kicks, you can see his face and body entirely contract and dedicated towards the movement, making it fast and explosive, opposingly a fat person's decision to do the same would be slower and weaker (obviously because he's untrained and fat he will be slower, but i'm strictly speaking about the strength of the decision- of the signal). also it doesn't have to be a fat person, it can also be a trained man, yet he still won't have the capacity for that decision.
edit 10.6: A more precise question: what determines the maximal amount(capacity) of generated electricity in the brain with decision? say a strong decision activates 10/10 of brain electricity, how can you increase it to 10/11; so the decision will be stronger?