Fit and nerdy

I am a nerd. It's what I am, and I love it. I saw this comic on one of my favorite sites, and I thought it would be quite fun to try out something along these lines.

http://xkcd.com/189/

I want to make a fitness game based on RPG leveling. I think that it would be a lot of fun to have levels and classes depending on what your goals are.

Here's something like I'm thinking:

Attributes:
Strength - measured by 1 rep max
Agility - measured by your mile speed
Endurance - measured by number of sets or by length of run
Willpower - measured by days at or under calorie goal and number of workouts in a week.

Classes:
Warrior - focus on strength
Rogue - focus on agility
Monk - focus on willpower
All classes have additional focus on endurance

Your class would be defined as the area in which you tend to focus your efforts in losing weight. For example, someone who focuses on strength training would be a warrior, while a runner would be a rogue, and someone who pays more attention to what they eat that how they exercise would be a monk. Levels are not something that I feel comfortable defining right now, so if anybody who knows what they are talking about would like to help create landmarks that would define them and at what point a certain level is achieved, that would be awesome.

Anyways, I hope we can play with this idea and come up with something really good!