I've had a couple pairs break recently, and it got me thinking. What do you do with broken/snapped shoe laces?
As others have said, bin them and buy new ones.
Good, I have a pair of them, will be interesting to see how they get on.I have had that happen with Magnum boots - no fault of the boots, just great laces!
tie the ends together and keep using them
Give them to the kids to play with and replace them with 550.