We have all been living a shoe lace lie.
Years of blisters could have been prevented if only we'd known of this hack earlier.
Introducing the 'heel lock', the genius use for that extra set of shoelace holes at the top of your trainers.
It's tricky to explain but you should be using them to create two loops that you then lace the laces through to create a tight fit that prevents your feet from pushing forward as you run and thus causing blisters to form.
Just watch the above video and feel your life get a little bit better in an instant.