Warm weather is on its way across the country — really, it is, I promise — and so are spring marathons, meaning that many people soon will begin a new or augmented running program. Many also will wind up sidelined by injury. But a new study suggests that being light on your feet could keep most runners healthy. http://well.blogs.nytimes.com/2016/02/10/why-we-get-running-injuries-and-how-to-prevent-them/