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During the leg raise the entire abdominal musculature isometrically contracts (contracts with no significant movement) to: Posture the spine and pelvis Supports the weight of the lower body so the lumbar spine does not hyperextend excessively Maintains optimal biomechanics of the Iliopsoas Hips are safe weight loss kept from prematurely flexing if the lumbar spine and pelvis does not hyperextend excessively Iliopsoas can contract more forcefully in a relatively slight safe weight loss 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 safe weight loss 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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