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FIGURE 8.3 Use of the abdominal muscles as stabilizers to prevent arching of the low back. (A) Excessive spinal
hyperextension, (B) desired spinal stabilization.A B
FIGURE 8.4 Use of the scapular depressors to prevent undesired elevation of the scapulae. (A) Excessive scapular
elevation, (B) desired positioning of the scapulae.