||Here's WHY they come untied, BBC Science 4/12,
"Mystery of why shoelaces come undone unravelled by science"...at Cal, yet!
So, in a somewhat delayed response (LOL), simply make an extra turn around before completing an ordinary "bow tie." Never comes undone even when I forget to secure bows in marathons. Good for flat and, especially, round laces.
Keep on smashing those records!