All our ‘555 Golf Family’ knows these very basic terms, but do we fully understand them?
‘Bottom Of Swing Arc’ (BOSA) is about establishing a precise ‘Top Of Spinal Column’. (see ‘Tether Ball Pole Concept’) The ball and rope do not change length. Neither does the length of our ‘Lever Assemblies’ other than a slight lengthening of our ‘Soft Tissue’ due to Centripetal, Centrifugal or Slinging Force. Therefore, if we ‘Set-Up’ properly, Chin & Chest Tallish, and maintain that ‘Top Of Tether Ball Pole’ (Steady Head) throughout our Back & Up and Down & Out Swings, we should generally accomplish an accurate, Sweet Spot Strike.
The ball consistently sits patiently at the ‘BOSA’. Always extend down, out and through the ‘Bottom Inside Cheek’ (BIC) of the ‘Little White Ball’. If this ‘Top Of Spinal Column’, changes, you shall hit either Fat, Purely or Thin … only three possibilities.