im around 5'7 weighing probably around 140-150. i think thats normal according to BMI. and heres a article regarding the "set point" theory. the article is released by MIT so it has to be a legitimate research. http://web.mit.edu/medical/pdf/set_point_theory.pdf oh and i have a 75lbs bag. i wish i had something a little heavier because my awesome punching power is too much for the bag and it swings all over the place. lol