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by space-monkey 5639 days ago
You could let the user designate a charity and get friends to pledge donations if the user meets their goal. A smaller charitable gift may go a longer way psychologically for some folks, and it may be easier for them to get their friends to pledge as well.

Then, when you go to eat the bowl of ice-cream or skip your workout, you think: do I really want to screw the panda bears/starving children/cancer sufferers?