Fitness RPG
I mean, you could totally use a tracking site of some sort, but I'm not sure if that would add a whole other layer of complexity or not. I personally run a lot, and so I use a Suunto watch, but then what do you do if you have people using different devices, I'm not sure how that would work.
I just personally hate the idea of strength training (or nearly any crosstraining to be honest!) and figured this would be a good way to inject a little of that into my life with some fun motivation. I have not really thought about the details much yet, but thought I would throw it out there. Cool to see some other people find it interesting as well!