Fats just sit and watch tv and eat.  Lots of hobbies out there that burn calories and build muscles without gym work.  Couple days ago i decided to go explore a local mountain ive never been on.  Hiked 15+ miles, from 2800(where i parked)-4500ft elevation.  Found a spot i wanted to set up a trail camera.  Went back today, took the most direct route possible, which was 2.6 miles each way, 1500ft elevation gain, with a 50lb pack on.  I dont do this as a chore to get exercise, i do it because its my passion.  Ill never understand how people can be content to spend their whole lives sitting on their couch.  What a waste.