I must have flunked tying your shoes class when I was a kid. I can't get a shoelace to stay tied. Even when I double knot, it's always coming undone. That is until recently when I discovered the 'Ian' knot. Actually I was introduced to the Ian knot a couple years ago and thought it was interesting. But when I started running, I found it to be invaluable. No more double knotting in order to keep my laces tied.
I won't try to explain how to tie it, instead, here is Ian Fieggen's website where he explains how to tie it and many other shoelace knots. If you have trouble keeping your laces tied and don't want to spend the money on something like Lock Laces, then check out the Ian Knot