The subject should be standing upright with weight evenly distributed on both feet.
1. Mark the spot.
Mark the spot halfway between the nipple and the crease of the underarm.
2. Pinch the skin. Using your thumb and index finger, grasp a diagonal fold, so that your fingers are approximately 2 cm from the mark.
3. Position the caliper: Ensure that the mark remains centered between the caliper tips and that the jaws sit perpendicular to the length of the skinfold.
General rules: taking skinfold measurements.