Originally Posted by OC 335i
Your shoes may not be right for you. Are they worn out? Try going to a Road Runner Sports and see if they can see what type of shoe suits you the best depending on your natural gait/running style/etc..
This might not be the cure-all but it might help. At stores like Road Runner sports they have treadmills and video cameras that capture the way to run for free.
I couldn't agree more with this ^. I had the same problem and as soon as I went to a running store, they assessed how I ran and changed my shoes to ones that support an overpronator. After that, I could do my 3-6 mile run like butter. All shoes, and even all Asics, aren't created equal.