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<http://schema.org/description>
"The quadratus lumborum are deep muscles with five heads that connect the lowest ribs and vertebrae to the pelvis and help with side bending and extension of the lumbar spine. These muscles are often tight in most people due to sitting. Stretch these muscles with side and back bends.LengtheningForward bending stretches the erector spinae muscles.Lengthening include:Padmasana with side bendContractingContracting one side of the quadratus lumborum muscles creates a side bend. Contracting both sides"
<https://www.liveology.org/magazine/quadratus-lumborum-body>