For many runners, athletic apparel is the last thing on their minds. Many of us grab an old T-shirt and shorts out of the drawer in a half-dark room, cram on the same pair of shoes we bought during the first Obama term, and then set out for our morning runs. After all, comfort is one of the benefits of running, and these things are comfortable. But there is a trade-off, and the risk involved in wearing old shoes is much higher than any comfortable feeling we get. Fundamentally, running…