Fatigue

It is nice to be tired after a good game/ workout. Sit quietly in silence, gather your thoughts and sip cold water. It is a nice feeling: the body feels the rest it deserves, and the being that inhabits the corpse actually enjoys being there. The rejoicing being aspires for grace and health is bestowed unto you. 

That simple it is! There can be no simpler formula to a long and healthy living. The whole ballgame involves matter and some water. 
There is will, of course. There has to be the push to make the inert matter move, and exercise. If it will not, then we may as well be dead.

'To keep the body and mind together' is what the ancients said. How very true! On this simple asset an empire can be built.