So, how does one figure out ideal body weight. I admit, that even though I what many consider a "healthy" weight, I am not sure if it is ideal. For some reason I really really want to get down to 125. I can't really explain why. Right now I weigh about 133 and am 5'5" and female. Also, if this really is a good weight for me to be at, how can I become more accepting of this? What I really want is to be more toned, have more endurance and to look more muscular. Is this reasonable or not? I need help setting realistic goals.