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In this instructional YouTube segment, the presenter explains how prolonged sitting chronically shortens the hip‑flexor muscles, which then pull the lumbar spine into hyperlordosis when a person stands and extends the hips. This excessive anterior lumbar tilt creates low‑back pain (lombalgia). To counteract the problem, the speaker demonstrates a simple kneeling hip‑flexor stretch: kneel on one knee, keep the other foot forward, and gently shift the hips forward to lengthen the shortened flexors, thereby relieving tension in the lower back.
