We Are What We Practice
A long time ago (although not in a galaxy far, far away), a rather clever fellow by the name of Buddha pre-empted the discovery of neuroplasticity by a thousand or so years when he said something along the lines of
"We are what we have practised. What we practice today is what we will become".
I say along the lines of because there are dozens of different translations but the message is basically the same. That the things we practice become stronger.
If I were a neuroscientist I could say it like this -
"If it fires together, it wires together".
Neurons that fire together build stronger connections so that sequence of firing becomes easier in future. As we practice something, the neurons fire together, wire together, build strong connections and whatever it is we are practising becomes easier and easier. We are used to this when learning skills - as we practice we get better. At first we have to think about what we are doing and it is slow and clumsy but eventually our bodies take over and things become smoother and more skilful. The sport you are practising becomes easier. The language you are learning becomes easier.