If the shoe fits wear it

Sunday I ran in my old running shoes because it was raining and there were a lot of puddles.  Today my calf and Achilles are sore.  I know it was because of those old shoes. Now I wonder if those shoes were not the source of my injury to begin with.  hmmm  Those were shoes I bought on sale at Sports Authority and they were probably not the best shoe for me.  From now on I am only getting my shoes at the running zone.  Although it may be more expensive they do a gait analysis and know the best shoe type for me.  It is worth the extra money to stay injury free.  I just don't have any more time to waste on a running injury.  I have decided to take it real easy this week so I can perform my best for the half marathon this Sunday.