Once you see the “vertical” nature of the swing, as I said I only see “up” or “down” with the swing action, you will spot it in technically superb swing actions.
Jack Nicklaus, at times, came so close to the optimal swing action, it’s why he was able to win 18 majors and snag 19 runner-up finishes (that’s 37 Top 2 finishes in majors, something you’ll never see again).









You may think it’s an odd question, but it’s a question for the serious, want to learn a proper swing person to consider.