Make a pledge to average a certain amount of running per week. Break your pledge once, shame on you. Break your pledge again, and you'll need to put your money where your mouth is.

Keep on the move! Track your workouts with Runkeeper and Beeminder will automatically keep your graph up to date. All you've got to do is sweat.

Beeminder will warn you if you're in the danger zone. As long as you keep your dots on the yellow brick road, your money is safe! (Details on our blog.)