12, Arm directions

Description

The third fundamental direction, the one for the arms, marked in orange, starts at the centre back of the neck (blue point), goes towards and past the green back armpit point, and then twists around the arms, as illustrated. The direction of the twist is the result of (1) the biomechanical properties of the arms – i.e., they move forward rather than backward – and, (2) the fact that the twist acts as a counterpoise to the balance direction for the torso