>>Tomte+(OP)
Last year, I learned Ian's Secure Knot[1]. It took under an hour of study and practice once, and my life was slightly improved every day from then on. Never had my laces come untied since then. Great ROI.
>>slavik+eH1
Same. Taught my kids to use this knot too. I never have to re-tie their shoes. I think this knot is easier to teach and tie than the classic knot.