Draw an imaginary vertical (up and down) line through the top of the head, the center of gravity, and the base of support. This becomes the line of gravity, or the gravity plane. This is the direction of gravitational pull (from the top of the head to the feet).
For highest efficiency, this line should be straight from the top of the head to the base of support, with equal weight on each side. Therefore, if a person stands with the back straight and the head erect, the line of gravity will be approximately through the center of the body, and proper body mechanics will be in place.
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