The abdominal muscles work to move the spine through flexion, extension, lateral flexion and rotation to create flatter abs and a flexible spine. Make sure you…more »The abdominal muscles work to move the spine through flexion, extension, lateral flexion and rotation to create flatter abs and a flexible spine. Make sure you are comfortable with the Side Bend exercise before attempting the Twist! www.PilatesOnFifth.com« less
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