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WATCH FOR: Sway back (see figure 3). This limits the hip
motion and moves the center of gravity backwards. Additionally, it
shortens the stride and may lead to legality problems. It may be
due to a weakness or tightness of the lower back or abdominal
muscles.
WATCH FOR: Excessive forward or backward lean of the
whole body. These are potentially injurious and reduce mechanical
efficiency.
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