The document discusses body mechanics and proper posture. Maintaining correct posture and center of gravity is important for lifting objects, as well as for sitting and standing positions. Proper posture involves keeping the body balanced so weight is distributed through the skeleton rather than straining muscles. Good standing posture balances the head, neck, chest and abdomen vertically. Good sitting posture is also well-balanced so weight rests on bones and not muscles or nerves. Correct body positioning and motion are keys to effective and comfortable body mechanics.