Answer: Sure. Create a playlist that alternates fast and slow songs, and turn your run into the perfect fartlek workout.
The constant pace changes will help hone your speed and burn more kilojoules, as it takes more energy to constantly raise and lower your heart rate.
Find tunes compatible with all paces at Web sites like jog.fm and upbeatworkouts.com. Download songs with 180 beats per minute for speedwork, and 100 to 120 beats per minute for warm-up jogging, easy recovery runs, and long, slow runs.
— BETH BAKER is a certified personal trainer and running coach.