clubchamp98
Journeyman Pro
Yes seen Rose do it a lot.Basically you stand upright behind the ball and try to determine whether you have more weight on one side or other measured by your feet. After that everything depends on length of putt and other matters all leading to a number of fingers break from the cup for the Aimpoint. I'm sure you've seen it but if not theres plenty of Utube videos out there
I am pretty decent reading greens so quite happy.
Thanks for the reply.