Walking brought along the lumbar vertebra to bend forward and rotate with the movement of right and left lower limbs. The main force to finish this movement came mainly from musculus psoas major.
步行带动腰椎向前弯曲并随左右下肢运动而旋转、侧弯，其主要作用力来自腰大肌。
The psoas (major on the right) is a very strong and powerful muscle.
腰肌（主要是右侧）是非常强壮有力的肌肉。
The psoas (major on the right) is a very strong and powerful muscle.
腰肌（主要是右侧）是非常强壮有力的肌肉。
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