Now there's no excuse for letting your workout regimen fall by the wayside when you're on vacation.
Audio guide maverick Soundwalk has teamed up with Puma to create TrainAway ($10, trainaway.puma.com), downloadable MP3 running tours for New York, London, Berlin, and Paris. In each city, a local personality grabs his or her favorite running coach to guide you on a four- to six-mile jog around the city's famed green spaces -- all while pointing out landmarks and giving running techniques. If sour weather keeps you inside, head to the hotel's gym, rev up the treadmill, and press play on the 40-minute indoor version. It tells you when to speed up and increase the incline and also offers insider tips on what to do once you hit the pavement.