Although paganism has died out, in Ancient Greece, they prayed to the Olympians. Their leader was Zeus, God of Thunder, and he ruled on Mount Olympus with his brothers, sisters, wife, and children. They prayed to the Gods for safe travels, love, wealth, and victories in war.
Besides the traditional fighting, it was not uncommon at all for the Greeks to train and exercise naked. Although it is something that people would never see today, back then, the naked body was nothing to be ashamed about. It was something to toughen.