Been running for nearly 35 years and can count on one hand the amount of times my laces have come undone. I run with several groups and different people and it always seems like the same j*****ff always has to stop because his mommy didn't teach him how to double knot his shoelaces.
I ALWAYS double knot for training runs and TRIPLE knot for races. 99.999% of the time it works EVERY time.
What gives? People overly confident that the single knot will hold for a 10 mile trail run?