Best iPhone Apps

WalkJogRun sifts through 600,000+ community-submitted running routes to find nearby places to run or walk.

CrunchFu turns the gut-torturing chore of stomach crunches into genuinely fun, gamelike play. The app uses your iPhone’s motion detector to count your crunches, rack up points, and even challenge friends, strangers, or bots to “crunch battles.”

Umbrella answers the question, Do I need an umbrella today? This bottom-line forecast is accompanied by brief temperature and precipitation details. Cute as this is, Umbrella proves its real value when it’s not even running: The app sends an alert when rain is forecast. It’s like having your mom call to remind you to wear your galoshes.

Trails is a GPS tracker that's perfectly tuned for capturing and sharing your adventures.

This workout encyclopedia presents over 200 exercises, all with clear photos and plainspoken instructions for how to do each one safely and for best results.

This nifty GPS-powered running log tracks your location, providing pace, distance, and altitude info, even mapping your running route.

iTreadmill is a good alternative or complement to RunKeeper to help runners and walkers measure pace and distance. The app uses the motion detector of your iPhone or iPod Touch to turn the device into a pedometer that counts the number of steps you take.

The toughest part of a diet isn't so much the portions or menu as it is staying motivated. Lose It! helps you maintain enthusiasm and discipline by turning the dreary details of calorie-counting into a video game. Weightbot nabs an honorable mention for its simpler and frankly adorable alternative to tracking weight loss.