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Great find—this is something I hadn’t come across before, and I’ve never seen it mentioned on the forum or elsewhere else for that matter.Stotty -
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Good, unique video.Originally posted by stroke View Post
The concept is similar to explaining conservation of centrifugal force using a spinning ice skater or ballerina.
Arms are wide, pull them in and you spin faster. If you seen an ice skater
From Exploratorium:
The conservation of angular momentum explains why ice skaters start to spin faster when they suddenly draw their arms inward, or why divers or gymnasts who decrease their moment of inertia by going into the tuck position start to flip or twist at a faster rate.Comment
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Someone pointed the ice skater arm tuck analogy to me years ago and I thought it was an incredible insight.Originally posted by jimlosaltos View Post
So to me, the left arm stretch not only holds in the coil initially, but it turbo charges the upper body rotation as the arm tucks in, as Jim mentions. What's amazing to me is that after the upper body has rotated so explosively, you can see Monfils' right shoulder is externally rotated in the third picture. There is a big stretch of the right shoulder being created as the torso opens but the arm and racket rotate backwards and lags. This is the famous Brian Gordon "flip" in action.
The same dynamic is at play when a pitcher throws a ball. The non throwing arm is straight and extended before tucking in to speed up the upper body rotation. And then as the upper body has fully rotated, the hitting arm is still lagging behind with external rotation of the throwing shoulder.
monfils_arms.jpg
pitcher.jpgLast edited by jeffreycounts; 05-05-2025, 08:32 PM.Comment
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Nadal has a very prominent off arm pressing back, as pointed out in this video. This guy on Fault Tolerant Tennis is definitely a cut above to me instruction wise. He had 2 previous lessons, one on "Shoulder Abduction Will Transform Your Forehand Contact Point" and and one on "How Shoulder Rotation Syncs Your Contact" that are also really good stuff.Last edited by stroke; 05-06-2025, 04:58 AM.Comment
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