I know blisters are not really an exciting topic. 

But I can tell you one thing for sure, if you're running a marathon and you get a blister, it is going to wreck your performance. 

You cannot perform at your best if you're thinking about some little stinging aching pain that you're getting because of a blister, and it really can make a real dent in your training too.

Today on the Doc On The Run Podcast, we're talking about the causes of blisters in runners.