Best 3 ways to tell when to replace your running shoes

This morning I was interviewed as a guest expert on a television program for a health and fitness segment. We were talking about how running shoes are really your only piece of injury protection equipment as a runner. The only thing between you and the ground is your running shoe.  When you are training in them just a little bit too long, they start to get worn out. Today on the Doc On The Run Podcast, we're talking about the best three ways to tell when to replace your running shoes.