A website called AchieveMint gives you points for engaging in healthy activities, like exercise, tracking your eating habits, or even taking health related surveys. Points can be redeemed either for cash (10,000 points are worth $10) or for Amazon Gift Cards. The app actually connects with other health apps, like Fitbit and MyFitnessPal, to track your progress.
If you are serious about earning money online through article writing, then you should try iWriter or Fiverr. Both sites do not pay much, however they are easy platforms to get started with. On iWriter, you sign up for free and you must create a piece of content as a screening. Once done, you will be able to take on work as it appears on the job board.