Very useful until item number six. Hate to be a "wet flannel" but if you are going to be technical please be accurate. Is it a wet flannel or is it a sponge and do I really want water squirting out on the floor. Where is the chair and is it the back of the chair towards me. Having and maintaining a good spine angle is such an important contributor to swing plane and to a swing's muscle memory that it may be worth repeating this exercise in the next issue of the newsletter. Best bit of advice that I have had to improve spine angle is to look at the ball as if through the lower half of a pair of glasses - it just tilts the neck up enough to encourage a straight spine.