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The primary muscle used in hip flexion is actually the Iliopsoas, one of many hip flexors. The Iliopsoas, indeed, does happen to originate deep below the lower portion of stretch the Rectus Abdominis. During the leg raise the entire abdominal musculature isometrically contracts (contracts with no stretch significant movement) to: Posture the spine and pelvis Supports the weight of the lower body so the lumbar spine stretch does not hyperextend excessively Maintains optimal biomechanics of the Iliopsoas Hips are kept from prematurely flexing if the lumbar spine and pelvis does not hyperextend excessively Iliopsoas can contract more forcefully in a relatively slight stretched position Bent knee (and hip) situps actually place Iliopsoas in a mechanical disadvantage Counteracts Ilopsoas's pull on spine Many people with weak abdominal muscles are not able to perform hip flexor exercises without acute lower back pain or discomfort The combination of the local muscular fatigue, or a burning sensation from the isometrically contracted abdominal muscles, and from the working hip flexors produces fatigue in the pelvis area which we mistakenly interpret as the lower portion of the Rectus Abdominis being exercised.
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