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Fun Run Trainer, $4.99, iTunes store
Pick a dream course and a pace; you see your progress on a video map of the route on your iPhone or iPod Touch. You also get audio updates.
Tester says: "I liked getting the view of my next race, right down to the inclines, while being able to control my music," senior Web editor Kristen says.
Music Interval Training Tool, 99 cents, iTunes store
Create two different playlists (one fast-paced, one slow) on your iPhone or iPod Touch, then input your interval routine. The app matches the music to your workout as you go from stroll to sprint.
Tester says: "The beeps before each interval change got me ready to adjust my speed, plus I didn't have to fiddle with my playlist as I pushed my pace," assistant Web editor Marianne says.
Softrace, free, Android Market
Grab a buddy who also has an Android phone and download this GPS-enabled app to both devices. Map a route and challenge your pal to a race (you can track up to 20 runners total).
Tester says: "I used the app solo to create my own 5K so I could compare my speed results over time," editorial assistant Karla says.
Originally published in FITNESS magazine, January 2011.