The muse comes from above, ready to flow in the means that has chosen: writing, singing, painting, acting, etc. This needs to be put into action, physically (voice, hands, body), in order for the world to perceive our art. So our body needs to move. We need our body to be strong and with energy in order to raise a strong signal. Physical motion brings us to the now. It brings whatever dream or creation we have in the mind, to earth. If we are stagnant, the flow is slow, it can even get stuck.