if u would like when i get the calculations i will post them here for u, ill explain a little abotu it in the first place...first off, im an exercise physiology major so we do many labs involving fitness and body composition, first we measured my weight height age, then we measured my residual volume, with my top score being 4.3, then we went into the underwater weighing tank where we did 9 trials and i was submerged every time blowing as much air out of my body as i possibly could, taking the last 5 numbers and avging them which came to 5.5, then we did some calculations with my body weight in kg's, and i believe the temperature of the water as well, and then used some control numbers and came up with my body density, and then changed it to %body fat and came up with 4.3%...my prof said hes been doing this for many years (hes in his 60's) and that is my body fat measured with the most accurate equipment available, we also used skin calipers, from 3 different skin folds, as well as the electrical bio impedence device which is the most inaccurate measurement...im not a liar, there is no reason for me to lie about this