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For example, if I curve my spine, which muscle group am I using?

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Bending forwards: Rectus abdominis (the "6 pack" muscle)

Bending backwards: Erector spinae group (the muscles running up your back either side of the spine)

Bending sideways: Abdominal oblique muscles (these are on the sides, in two layers, running between the hips, rib cage, and the centre of the abs)

Twisting: Also abdominal oblique muscles

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