Move with Your Brain for Paleo Fitness  The brain controls all
movement (in fact, the original need for a human nervous system,
from an evolutionary standpoint, was to coordinate movement).
The brain contains hundreds of billions of neurons (cells), with
each single neuron making thousands upon thousands of
connections to other neighboring neurons. These neural
connections are the circuitry that enables all activity — both
mental and physical.  To illustrate this point, think of riding
a bike for the first time. It likely felt clumsy and awkward. If
you tried it without training wheels, you may have even fell
onto the pavement (and probably more than once). Your brain
worked hard to establish the neural pathways to enable you to
perform this activity efficiently.  But with enough practice,
patience, and band-aids, the day finally came when riding a bike
felt effortless. Finally, your brain hard-wired the neural
pathway for this activity, everything coordinated efficiently,
and the ride was smooth.  Functional