11. Get paid to work out

Women running on treadmills | iStock. com/g-stockstudio

Fitness freaks can turn their love of running, yoga, and mountain biking into cash with Achievemint. The app links up with the fitness and health-tracking apps you’re already using, like Jawbone and Fitbit, and then rewards you with points for completing certain activities. Not only will you get points for working out, but you can also earn when you weigh yourself, log what you eat, and even when you sleep. Once you have 10,000 points, you can cash them out for $10.

If weight loss is your goal, consider signing up for DietBet. You’ll pay to join a pool of other motivated dieters, who all have the goal of losing a certain amount of weight within a certain time frame (say, 10% of your body weight in 6 months). If you successfully complete the challenge, you and the other winners get to split the pot.