Keep elbows in to stabilize your putting stroke
The coach describes a point of connection or 'pressure point' in the putting stroke created by keeping the elbows in, which he says has helped players under pressure and stabilizes the stroke path and the club face. The feel is of hitting with the center of the body rather than the hands, with the arms just along for the ride.
Channel: PorzakGolf
Watch official source at 4:34