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The phrase that you want to look for is "gamification", it's a somewhat new field of study in motivation, and it's basically how to apply game concepts such as higher reputation, achievement badges, privileges for higher rep players (Does this system sound familiar? :) ) to everyday concepts from play to work and achieve higher work levels and output. ...
FitRPG fits your bill, I think. There is no storyline (their Kickstarter to add one failed to fund), but you do get to upgrade your character.
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