The @actfit style reward system is already being used by a number of medical insurance companies but the silly thing there is you're closed off to agreements they have with gyms and retailers. @actfit could take it to a completely new level and instead of each company having to build their own application and manage it they can simply extract it from the chain and allocate their rewards in tokens or additional rewards and allow users to redeem it at their participating retailers.

Creating such a large ecosystem that various levels of value chain can tap into would be amazing. I also see Lympho trying to do the same and they're already listed on the Samsung app store