5 Fitness Apps to Get You Off the Couch

iMapMyRideTurn your iPhone into a cycling partner that tracks your speed, distance and route. iMapMyRide also has a GPS locator that connects you with your biking friends, too. You can see what courses they've charted and follow their progress as they ride. There's also a friend feed feature that gives status updates for all your buddies' workouts. It helps everyone keep motivation high — and at the end of the day, you can find each other for a well-deserved post-workout snack.

Couch to 5K
The hardest thing about getting in shape is getting starting, and that's where Couch to 5k comes in: you can be an ice cream-eating, Housewives of Beverly Hills–watching couch creature, and this app will coax you into a runner within seven weeks' time. The 20-to-30-min. workout plans include interval training, warm ups and cool downs, as well as a way to incorporate Nike's running system and your own playlist.

Jillian Michaels Fitness Motivation

If you enjoyed watching Coach Jillian kick butt on The Biggest Loser, this app might help bring a little of that same intensity to your own workouts. Equipped with a sensor that measures how many calories you're burning, a pedometer to track distance and a GPS unit to help you map routes, you can bring all the metric conveniences of the gym to the outside world.

Virtual Trainer

Lose weight, bulk up and perfect your form with the Virtual Trainer app. It has a database of more than 300 exercises and warm-ups with step-by-step pictures; more complicated exercises are accompanied by how-to videos. You can also use Virtual Trainer to help tone specific problem areas like your abs, arms, back or chest. The app will log your workouts and keep track of maximum weights and repetitions; it even lets you add your own custom exercises to the log. The one big complaint about the app is that it's pretty slow over a 3G network.

FitnessBuilder

FitnessBuilder combines all the workouts in PumpOne's iPump fitness series, which include everything from strength exercises targeted at seasonal snowboarders to at-your-desk stretches for office workers stuck staring at computer screens all day. With 700 workout plans, 5,600 instructional videos and a complete analysis of your progress, the FitnessBuilder app is nothing if not comprehensive. The app even has a digital cheerleader called the "inspire" feature, which emails you your session logs and recaps the stretches you've done.

By: Time.com