There are over 200 bones and more than 600 muscles in the human body. Some muscles can be voluntarily controlled; others are used without us contributing much. When it comes to movement however, we have to learn everything from scratch. So when we were born, we already had the hardware to move around, but were missing parts of the software. That basically means the central nervous system needed to learn how to control muscle contractions and how to coordinate them to create controlled movement. This stuff is stored for later recall, since it would be a pain in the ass to have to learn everything again the next morning.
Now think about this for a moment here: the CNS learns how to control and coordinate hundreds of muscles at the same time! The amount of computing power, bandwidth and storage capacity needed for that is unparalleled even by the most sophisticated computer. However, there’s a small caveat. The CNS will adapt your body to whatever you do for longer periods of time.