Article: Early fish hit land to be better predators| New Scientist

"Our distant fishy ancestors first hauled themselves on to land in order to warm up in the Sun. So claims a team that says basking would have provided an energy boost that made the fish more agile in the water, improving their chances of snaring prey. It was also an evolutionary milestone that heralded the rise of all land vertebrates, including us."

And even now, we like to hang out on the beach, get wet and end up being more energized. It is true: What goes around, comes around.