God, you haven’t even been out five minutes and you can already feel the sun burning your shoulders. That’s got to be cause for concern. Six miles of this kind of exposure and you’re probably looking at some serious, lasting damage. Really, what good is running if, in the end, you’ve got melanoma. There’s not a single cloud in the sky, and your mom’s SPF 200-something is apparently worthless. Look at it washing away with your sweat, like water off a dirty paintbrush. There’s no question it’s going to make …