Your setup posture is crucial to hitting solid shots and breaking 100. Weaknesses in the rectus abdominis or glutes can cause either a rounding of the spine or something we call "S-posture," which occurs when there is too much tilt from the pelvis (the spine bends in the shape of the letter S; inset, bottom). In either case, the excessive spinal curve inhibits your ability to rotate toward the target and maintain body angles prior to impact. At address you want to keep the spine as straight as possible, though there will be a slight bend around the neck.
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