When you're training for a race, it is tempting to go to extremes. But that makes this a prime time to watch for warning signs of overtraining, advises Corey Wencl, who supervises athletic training ...

DEAR MAYO CLINIC: I’ve taken up running again and decided to enter a half-marathon. I know I have to push myself to get ready for the race, but I don’t want to overdo it. What should I watch out for ...