scoliosis problem: white caucasian school boy (student, pupil) sits on stairs bent back, neck over device

american back backpack bend bent boy caucasian childhood concept curvature danger day deformity european gadget game health horizontal hunch hunching kyphosis lifestyle little lordosis male neck online outdoors person playing posture problem solving pupil schoolbag scoliosis shirt sitting slouch slouching small smartphone spinal spine stoop stooped stooping student unhealthy white young school sits stairs device