I won't lie, I hardly ever exercise.  Occasionally I'll do 10 squats while I'm brushing my teeth or something.  I'm 123lbs, though.  When I decide to go for a hike, it's something I can easily accomplish because I'm not a sea cow.  Outside of how disgusting it is to look like a can of exploding biscuits, why would I want to get out of breath just from walking a flight of stairs? That's pathetic.  My fucking dead grandma gets more physical activity than fatties do.