How to Prevent Running Shoe Blisters with the ‘Lace Lock’ [VIDEO]

I have a lot of friends that are marathon runners. I wonder if they are aware of this trick.

This tip is for people who are tired of getting blisters on their heels when they go running, walking or hiking.

I always wondered how you were supposed to use that extra hole on your shoes. Now we know!

Do any of my running friends do this?