To determine one's shoulder and arm swing planes, where are lines drawn (at the top of swing) on the picture?
Does the line drawn to determine the arm swing plane vary (point to point) if in one swing the left arm is straight and in the other swing the left arm is not straight (along forearm or along upper arm)?
Does the line drawn to determine the arm swing plane vary (point to point) if in one swing the left arm is straight and in the other swing the left arm is not straight (along forearm or along upper arm)?