How to Find Ideal Posture?
If you imagine a plumb line dropping from the ceiling by the side of the body. The plumb line should intersect the ear lobe, then run to the shoulder joint, then through the greater trochanter in the hip (the bony bit on the outside of the hip), then just in front of the knee joint and finally slightly in front of the lateral malleolus in the ankle (the bony bit on the outside of the ankle) before it reaches the floor.
If a body part, for example the earlobes is ahead of the line, then the head and neck are not in an ideal position and there is increased tension placed on the muscles in the shoulders such as the upper trapezius - which may lead to neck and shoulder pain. Another example is if the knees are locked back or overextended. In this case the knee joint line is behind the plumb line this can place increased pressure through the knee cap which may lead to knee pain.