If you have trouble sticking to your New Year's resolutions, this app may help. PACT keeps track of the exercise or diet goals you set...and pays you for sticking to them (it also takes money from you if you don't).
Let's say your goal is “go to the gym 3 days a week”. If you do it, you earn $10...if you only go to the gym twice you are docked $10. GPS and the motion sensors in your phone keep you honest and report back to the app.
This is a community based app so the money you earn comes from other members having to pay out for not living up to their resolutions.
Similarly, if your goal is “to eat veggies with at least 4 meals a week”, you have to take a picture of your plate and have it verified by another member in order to get credit.
The app works with fitbits and other exercise trackers and they say it has helped their members hit 95% of their goals.