Sure, your running or walking shoes feel super comfy. There may be plenty of tread left on the bottoms. And those day-glo green features may still be shining bright. But looks (and feel) can be deceiving: The more wear-and-tear on the shoe, the faster its sole and shock absorbers break down, leaving you with a less-than-supportive sneaker that can cause injury. So when should you replace those athletic shoes? Here are some guidelines: One Shoe Does Not Fit All There’s ...