4. Pact

Exercise, eat health and make extra money? Yes, there really is a way to make your body and bank balance a little healthier. With Pact, you promise to exercise a certain number of times per week or eat a certain amount of healthy meals and in doing so can allow you to make up to $5 per week.
There is a slight drawback to the app… if you miss a healthy meal or do not work out as you promised you will be deducted $5 from your balance. If there was ever an incentive to eat healthy and get in shape, then this is it.