Muscle memory..
It means tat When an active person repeatedly trains movement, often of the same activity, in an effort to stimulate the mind’s adaptation process, the outcome is to induce physiological changes which attain increased levels of accuracy through repetition. Even though the process is really brain-muscle memory or motor memory, the colloquial expression "muscle memory" is commonly used.

There are two types of motor skills involved in muscle memory: fine and gross. Fine motor skills are very minute and small skills we perform with our hands such as brushing teeth, combing hair, using a pencil or pen to write, touch typing or even playing video games. Gross motor skills are those actions that require large body parts and large body movements as in the throwing sports such as bowling, American football, and baseball, sports such as rowing, basketball, golf, judo, and tennis, and activities such as driving a car (especially one with a manual transmission), playing a musical instrument, and marksmanship.

Muscle memory is fashioned over time through repetition of a given suite of motor skills and the ability through brain activity to inculcate and instill it such that they become automatic. Activities such as brushing the teeth, combing the hair, or even driving a vehicle are not as easy as they look to the beginner.

As one reinforces those movements through repetition, the neural system learns those fine and gross motor skills to the degree that one no longer needs to think about them, but merely to react and perform appropriately.

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So, that's basically how i brush my teeth every morning, comb my hair, play my organ, take my exams ( no wonder i'm failing), and even having kids i didn't know of.... Last part was a joke...

Confidently, I dare say i rely too much on my muscle den my brain. I let my muscle do the work as I rest my brain 24/7... No wonder it feels so easy swearing nowadays.. I'm too use to it and the muscles in my lips and tongue have suited it... XD