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Meet your tenderloin muscle . your psoas, the only muscle that connects your lumbar spine (lower back) to the upper part of your thigh bone (femur). Sitting for long periods can shorten and tighten your tenderloins, making them weak, giving you issues like tight hips, lower back discomfort, and bad posture. To fix it you can: *Lengthen with extended overarm lunges *Strengthen with a floating L-sit *Tenderize with massage ball #stretchingdaily #scienceofstretching #lengthenandstrengthen
