It's getting late in the day and Giants reliever John Brebbia has just finished his workout. He can already feel the soreness creeping in.

He gathers up his glove and bags and begins heading home. There's an afternoon game tomorrow, so he has to get to bed early.

But before he gets ready for bed, before he actually goes to sleep, he has to do one more thing. One very simple, but important task.

He fills up a glass with ice, places it on the counter and pours in a magical sort of refresher, or relaxer, that he's been using nearly every day for the last couple of years. A drink that players all across baseball have been using, that athletes in pretty much every sport have bought into.

Tart cherry juice.

"It’s my little sleep routine," Brebbia said. "It helps me relax and fall asleep."

Baseball players have not always been the healthiest of athletes.

The current best pitcher in the world has mostly subsisted on fast food. Babe Ruth reportedly enjoyed breakfasts of bourbon and steak. And there's still a long-running how-many-cheesesteaks-can-you-eat contest in Philadelphia.

But over the last couple of decades, ballplayers have bought into the idea that, well, maybe to stay on the field and be healthy and win, they should do everything they can to keep their bodies in the best possible shape.