
Fitbit —
In the age of connected, wearable tech, you don't have to work out on your own. Fitbit trackers sync the number of steps you take with mobile apps and compare your 7-day averages to friends' on a leaderboard. You can cheer or taunt your friends on the Fitbit site.

RunKeeper —
The RunKeeper community is enthusiastic, global and supportive. The mobile app lets you find new running friends based on your location, or search for people who are at the same fitness level as you.

Endomondo —
One of the more social tracking apps, Endomondo offers public challenges for a variety of sports. Leaderboards show things like who had logged the most walking miles for the month or spent the most time being active, as well as comments from participants. The apps have a newsfeed for communicating with workout buddies in real time.

Strava —
Strava connects with GPS-enabled devices such as the iPhone, Android phones, and Garmin trackers. Compare how you do on a specific segment of a road against other athletes who run or bike the same spot, create clubs and take part in challenges with friends. It's free to join, and an optional premium membership adds more features.

iSmoothRun —
This training app is for data geeks. It connects with many other services, including RunKeeper, Strava, Garmin Connect and Tribesports, and can pair with wearable devices like cycling sensors and heart-rate monitors. iSmoothRun's graphs and stats are thorough and let you post data to Facebook and Twitter before, during or after a workout.

Wrist band trackers —
These tracking devices are worn on the wrist and sync your progress with mobile apps. The Nike+ Fuel Band lets you connect with friends and see a leaderboard to compare progress.

Zombies, Run! —
This brilliant app turns regular workouts into a survival scenario. In Zombies, Run! you must outrun the undead on missions to collect supplies while following a story of a zombie apocalypse. There's nothing like fleeing bloodthirsty zombies to get the heart rate pumping.


