Extends, laterally flexes, and assists in rotation of vertebral column.
The erector spinae and quadratus lumborum lift and straighten the spine in tadasana.
Open chain contraction of the quadratus lumborum draws the ribs downward during respiration.
The erector spinae muscles are the prime movers in the back bend purvottanasana. Combine contracting the erector spinae with the synergists of this pose, including the quadriceps, gluteus maximus and triceps. This combination stretches the rectus femoris, iliopsoas, rectus abdominus, pectoralis major, triceps and anterior neck muscles.
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