If distance running was a product, it would come with the following prominently written on the label: WARNING – You WILL get injured. Every runner I know who has been at it awhile has a war story - hamstring injuries, plantar fasciitis, shin splints, knee pain. True devotees to the sport seem to spend equal parts time training and trying to keep their bodies healthy. Because of this, when I started my training for Chicago I was alert to the possibility that at some point my body might call an injury timeout. What I did not expect was that the injury would come not from running, but from a game of hopscotch.