What works things is your, Nervous System. What Helps that is Posture, it allows less Stress on the Spinal Cord and Head, so it can perform to its Optimum. Without good Posture, Muscle will not Perform as it should, losing Balance and its direction. Giving Bad technique, and Bad Form, Leading to a quicker road to injury, and Bad practice. Improvement will not happen, you will become Bored and Pissed off, hope this Helps .