i dont go to gyms, and i dont do any kind of pushupps or nothing like that, i just play football 2-3 hours a day every day, and i dont really watch what i eat, i eat alot of sweet stuff, chocolates, ice cream, chips, etc...
Football works for me, my weight is 54 kgs and im 1.80 mts
although i would want to know some excercices to get a six pack, because right now i have a 4 pack (wich is pretty good if you consider that i dont do push ups)