I stumbled across this a week or two ago. You can earn rewards just by connecting apps you already use! You can earn rewards for staying in shape!
Earn free gift cards and rewards with AchieveMint. Click here and register an account. You can connect apps like Fitbit, Foursquare, MapMyFitness, Twitter, Garmin, Jawbone, and more.
Once you earn enough points you can redeem your reward.