Have you ever wondered what those two extra shoelace holes are for? Usually, they remain unused and in fact hardly anyone knows that they are for.
A YouTube video solving this unusual riddle showed up in the middle of last month and social networks discovered it just a couple of days ago. More than two million people have seen that video since then.
The last two shoelace holes serve to immobilize feet inside of shoes in order to make shoe tight on foot and to the make running more comfortable.
Watch this video to see how to execute the lace lock properly: