Which body positions are used for observing posture?

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Observing posture relies on watching how the body's segments align in relation to gravity, including the spine’s curves and pelvic tilt, with as little muscle tension as possible. Lying flat—both supine and prone—lets the muscles relax and gravity reveal the true structural alignment without the influence of active muscle guarding. In these positions you can cleanly assess symmetry, pelvic orientation, and the spinal contours, making it easier to spot fixed misalignments or asymmetries that might be masked when the person is standing or actively supporting themselves. While standing shows how posture behaves under weight-bearing, the lying positions provide a clear baseline of alignment, which is why they’re used for observing posture.