tossing a ball Stream of Consciousness

Muscle contract, extend, and I then release in from my five way grip and it soars not as hard as I had wanted, but bounces with considerable force from the wall. Repeat. Am I enjoying this, I suppose so. Why am I enjoying this? How would an enjoyment of tossing help a proto human hunt, eat, reproduce? And yet it happens to be a rhythmic, almost hypnotic action. Bap. Bap. Bap. It seems like the poor round thing must be all but dead now, bruises cascading down its supple hide. Bap. Bap. It's sunny today.