A favorite singer/songwriter/guitarist of mine, David Wilcox, took a request from an audience member one time when I was seeing him in concert. It was an older song of his, one he played rarely. After fumbling around on the fretboard a moment or two, he found the right notes and said, “Ah. The fingers remember long after the mind has forgotten.”
Having not worked for over a year and I half, I was really, really worried that I had forgotten everything I knew about computers. But opening a UNIX shell, my fingers remembered.