The cause of the “back pain” when a man stands up straight. view from the side The spine is not vertical to support the body. but slightly S-shaped arch above the pelvis and the pelvis is slightly tilted relative to the floor. In this state, the body is subjected to forward force, the lumbar burden is too heavy. Conversely, the neck should support a head weighing 4 to 5 kg and maintain a high level of flexibility. for complete movement





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