Chafing is inevitable, even after you've cut out the elastic running shorts liners and put on a layer of spandex. And chafing on a long run can quickly turn from uncomfortable to unbearable. So three cheers for lube. We've all got some experience with personal lubricant, but with running, the ideal substance is a little different: We're looking for something clean-feeling and smooth, not a slip-and-slide. Body Glide has the consistency of a deodorant stick and applies with the same ease. Plus, it works on any part of the body that chafes or blisters on a run – inner thigh, nipples, feet, you name it. [$10; bodyglide.com]