"Keep your shoes fresh and trade them out before they need to be replaced," Hall advises. "In high school, I used to think it was a badge of honor to run the tread off the bottom of a pair of running shoes. Now I realize that's stupidity, and just asking for an injury. I usually go through a pair of shoes every month or sooner." Obviously, new shoes are especially important when you're recovering, when re-injuring yourself is even more likely.