Here's an idea, what's just as addictive as collecting junk in a season based game? Fitness... You get a little avatar that's you, you log 100 sit ups in the app then you're avatar gets a 6 pack for a week. Do them every day for a month and get it gets totally ripped. Give actual gym owners special accounts pokemon style, if you beat that gyms workout you get a little badge and join that gym. There you can do approved and authenticated classes that give you extra points. Group boss battles, a big caterpillar attacks your gym, you all have to do 15 pull-ups a day to rip it off. The dreaded pvp, i can compete in battles against my pals, I do a 10k they have to match it or my avatar kicks theirs in the shins... -5hp and lose that 6 pack. I'm not doing this one,I have no idea how to do the fitness part of that, and it would need money to set it all up. Still, fun idea for a fitness person though right? All the rpg elements map across nicely.