flat back posture

flat back posture,

n posture characterized by the presence of a slight plantar flexion of the ankle joints, an extension of the hip joints, a tilt of the pelvis towards the back, flexion of the upper portion of the thoracic spine, and a slight extension of the cervical spine.
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Flat back posture.
References in periodicals archive ?
If you display a flat back posture you may need to use a lower back support for certain exercises especially when lying on your back.
He keeps his shoulders slightly over or ahead of the bar, and establishes a flat back posture by pulling the shoulder blades toward each other, holding the chest up and out and tilting the head up slightly.