The 7 Joint Structure consists of:
The three lower joints (1.a.S.N.T.) -
The ankle joint (1) - The knee joint (middle) (2) - The hip joint (3).
The link - The spine (the neck - top of spine) (4)
The three higher joints (1.b.S.N.T.) -
The wrist joint (7) - The elbow joint (middle) (6) - The shoulder joint (5).
Angles at the lower or higher joints "strings" are changing when rotating the feet and hands (Unit Circle).