Consult a BMI (Body Mass Index) chart to find your ideal weight. The healthy weight range spans from BMI 19 to BMI 25. The wide range accounts for both genders and individuals of all shapes. Start at the middle of the range and work up or down from there. Men usually prefer the mid-point to the top and women often prefer the middle to the bottom, but bone structure and muscle mass make all the difference. A large-boned, muscular person should be near, or slightly above, the top, whereas a small-boned young woman might feel best at BMI 19-20. For you, at 172 cm (5’7.5”), an acceptable weight is somewhere between 57 – 73 kg (125 - 160 lb).