why do we automaticaly remember the things ( such as playing a guitar, riding bicycle, swim...etc) although?

Question

we did not do them for many years

Answer 1

It is called neuro-conditioning. Your brain develops a literal groove in your brain that "remembers" how to do a certain task. This is why it is so hard to quit smoking, biting nails, etc. Once we have developed a "habit" it is impossible for our brain to forget, it needs to be replaced with something else.

Answer 2

Procedural memory. It's engrave near the area that control our heart/lung?