UPDATE: App appears abandoned by developer

The app used to be updated frequently but its been almost a year since the last update and the developer appears to have moved on to their other app Sworkit. There used to be a lot of users and activity but it has slowed considerably. The plus is that its free but for workout or activity tracking and/or competition there are many apps that are much better and sync with HealthKit. (This app syncs with Runkeeper only)

Very well done app with lots of features. I highly recommend getting friends (you can find them in app, very supportive community.). Beginners can compete against athletes. While you can earn "rewards" in a few different ways, I dont think thats the best part of this app (maybe for some - note mPoints, one of the reward companies, is not the same as the developer NeXercise. mPoints has some ... customer service issues. ) For most people having fun or getting excited about exercising is a much better reward! Great for all levels of ability, especially for those days you cant get going!

gschoen about NexTrack – The mPoints exercise and weight loss tracker for motivation improve your health & fitness and lose body fat