Photo: www.djsteveboy.com

You replace your running shoes regularly, so why not replace your music? Now, there's a reliable MP3 tool to help you fill your ears with music that fits your workouts: Podrunner.

FitSugar has the scoop on Podrunner, free electronica music for a variety of fitness fans. Podrunner's brainchild, DJ Steve Boyett, regularly releases fixed bpm, one-hour mixes anywhere from 130 to 180 beats per minute. All mixes are archived, which means you'll have no trouble finding an hour of music just right to fuel a relaxing walk to a bomber trail run.

And, amazingly, it's free (although Podrunner gladly accepts donations). If you're looking for varied bpm, check out his Podrunner Intervals, which debuted earlier this year.

Sprinkling in walking intervals may just extend your runner life.