Endurance...
 

maybe you should be able to do excersies like jump rope and stuff and your endurance points will increase or it takes longer for your endurance points to drop when you walk k

That'd be cool...exercise

Yeah.

But we'd have to make it so jump roping was actually work. And not just that gani playing all by itself.

Swimming laps should increase your endurance too...

Yeah until ya tire out and drown! :p

My point exactly.
The lower your endurance gets, the higher your max endurance goes up. So you can run laps around the mountain until you can't move, and you gain 1 endurance point. You can swim until you nearly drown, and gain 3. You can jump rope until you almost pass out, and gain 3 or something...but you can't just set an AutoD to do it for you, or you'll drown, get PKed, or cramp up. ^_^