WHAT IS S – POSTURE?
S-Posture is a swing characteristic caused by the player creating too much arch in their lower back while in the set-up position. This excessive curvature in the lower back puts a tremendous amount of stress on the muscles in the lower back and causes the abdominal muscles to relax. The relaxation of the core muscles can cause a loss of posture or a reverse spine angle during the backswing. As a result, the lower body is put out of position on the downswing and will affect the swings sequence of motion.
Articles and Swing Drills for S- Posture