If you've been playing ball or been on the field, you should always be taking in lots of liquids. Get the thirst quencher 411.
If you're exercising in the sun, you're going to need to know all about heat illnesses and how to prevent them. Get schooled on keeping your cool here.
Just a few years ago no one was really THAT into vampires. As far as movies went, these blood-thirsty characters were pretty much restricted to the story of Dracula and other historical references. Not anymore.