I never excercise but I'm always playing games or on my computer and I naturally have a high metonalism. I am not fat and I actually have a 2 pack on me going XD. Only reason I have recently gone to the gym and play racketball with friends is to burn time and win my 6 pack :P
Also, I did swimming in my highschool (I'm in college nao) so my stamina is also pretty high :P