I've just done a quick search for running music with BPM and have discovered jog.fm. You can search by BPM and it gives you a rough idea of what sort of 1k time you'd manage if you kept to the beat of the track. It comes up with lots of ideas, from several genres of music. Seems like a good idea if you want to run to something interesting with the correct tempo. I've just created a 150-160BPM playlist on Spotify using it. Gonna try it out tomorrow morning!