I believe that thoracic mobility is key for good shoulder rotation. The speed of the rotation and ability to strike adds power to the underwater stroke and at the same times helps the recovery arm with elbow above the shoulder.
Is there an optimum amt of rotation for swimmers or is the standard 45 degree shoulder rotation a general rule of thumb?
I would imagine as long as integrity of core is maintained more rotation can give more power? If so, does the distance of the race matter.
Please let me know if I am on track or am mistaken!
Thanks for sharing your brilliance!??