This cat on the Reformer exercise with the Jump Board allows you to stretch all the multifidi muscles (is one of the 3 transverse-spinalis muscles of the spine along with the semispinalis and rotator cuff muscles. This muscle is present all along the spine and is particularly developed in the lumbar region).
Retro version of the basin on the exhale and ante version on the inhale.
I added to the movement the stretching of the arm and shoulder muscles
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