The Promise Keeper uses Facebook and Twitter to hold you to your word.

Reebok has released a new app for the iPhone and Android that informs your friends when you have planned to go out for a run and whether or not you actually do. The Promise Keeper utilizes Facebook and Twitter integration to provide peer pressure that should spur you on.

When you schedule a run, the app will let your friends on the social networks know. If you complete your run it will praise you on the sites and if you don't it will tell all your friends you didn't keep your promise.

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