Loss of posture is defined as any significant alteration from your bodies original address angles during your golf swing. This loss of posture can affect all aspects of the golf swing including timing, balance and rhythm. Losing your spine angle or changing your posture typically causes two types of miss hits; a block or a hook.
In order to not lose your posture during the golf swing, several physical characteristics must be developed. First and foremost, research has shown that any limitation in performing a full deep squat or full hip bend can force a player to lose their pelvic posture during the downswing. Failure to perform a deep means generalized stiffness and asymmetry in the musculature and joints of the lower body. Secondly, the ability to separate your upper body from your lower body allows your shoulders to rotate around your spine without altering your original posture. Limited trunk to pelvis separation is usually caused by reduced spinal mobility and shortened lat flexibility. Thirdly, the ability to stabilize your spine angle during the swing is directly proportional to the strength and stability of your core musculature (your abs and glutes). When it comes to spinal stabilization the core is the most important aspect. These muscles help keep your trunk flexed forward throughout your golf swing. Finally, in order to rotate around a stable posture one must have good flexibility in the hips and shoulders. This allows you to get the club into key positions without altering your spine angle.