Let us embrace the scientific fact that ‘Over Swinging’ is often a negative characteristic. (Across The Line - Below Parallel) ‘Under Swinging’, not completing the Back Swing, is also a negative if you have pre-selected ‘A Full Swing Procedure’. (incomplete Swing Sequence #5)
Add the fact that ‘Muscular Tension’ is a very negative element. One can get ‘Tight From Toe-Nails To Finger-Nails’. (see ‘Tetanous’) This golf death knell interestingly generally starts between the ears. Practical golf knowledge, evolving into ‘Experience and Wisdom’ creates ‘Confident, Comfortable & Consistent’. (see ‘the 3 C’s – Trust & Relaxation)
We generally know that swinging a ‘Bigger Golf Back Swing Wheel’ (see ‘Arc, Width & Circumference’) is beneficial … more duration to accomplish Clubhead Speed. It is relevant that the ‘Back & Up Swing’ is the “Dress Rehearsal” to the ‘Down & Out Swing’. Feel that reality!