GETTY IMAGESMost runners know about injuries. They're almost part of the game. Run long enough or hard enough, and you'll probably come down with an ache that will temporarily sideline you.Fortunately, most running injuries are short-term. After a
week with no injury. The same goes for marathon runners or anyone bouncing back from a layoff: in a fit of enthusiasm, how many of us try to add 50 per cent to our normal mileage and return to speedwork all in the same week, only to plummet back
