105 Jin's weight is reduced to 103 Jin, which is 1' 8' s waist circumference. According to the inquired public information, the measured waist size is1.03kg.. Use a soft ruler to measure the horizontal girth of the waistline passing through the navel center or the girth of the connecting line between the lowest point of the rib and the midpoint of the top edge of the iliac crest, and measure it before inhaling at the end of expiration.