The deep spinal muscle that shuts down from sitting and why your erectors lock your back rigid to compensate. Your back isn't tight because it is weak. It is rigid because the tiny stabilizers along each vertebra, the multifidus, tend to shut down when you sit all day, and the big erectors take over to keep you upright. ㅤ Cat-Cow + Quadruped Thoracic Rotation: slow, segmental, one vertebra at a time. If you can't feel each segment move, the multifidus has likely gone dormant. ㅤ Save this for your next session. ㅤ Drop BASICS below. Grade 1 Mobility is 4 weeks of follow-along, $29, community and all. ㅤ #Elastaboy #Reboryn #BackPain #MultifidusActivation #SpinalStability