Energy cost (swingback), strength and flexibility, age (ex: stooped posture, osteoperosis, dowager's hump), psychological aspects (stressed? afraid? embarrased?), evolution and heridatry influences, structural deformities (structural deformities, congenital anomalies, trauma, scioliosis), disease, pregnancy, habit, and pain even ear lobes, shoulders, inferior angles of scapulae, iliac crest, PSIS, Greater trochanter, Buttock/knee creases, Malleoli. Poplitean Eye, Lateral Toe sign, elbow windows, muscle bulk/atrophy, patella lasers, genu varum/valgus, arch height stroke, community dwelling older adults, frail elderly, parkinson's disease, LE amp., sci, arthritis, lower back pain, rheumatoid arthritis, acute medical patients, MS, Healthy kids 3-9, Cerebral Palsy