Nice instructional piece

[stroke]

https://youtu.be/McCb-RfYd0w?si=4Kif0qNySkgO_o3X

[stotty]

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.

[stroke]

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.

Same thing for me.

[jimlosaltos]

Same thing for me.

Good, unique video.

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.

[jeffreycounts]

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

Someone pointed the ice skater arm tuck analogy to me years ago and I thought it was an incredible insight.

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.jpg

[stroke]

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.

[stroke]

https://youtu.be/5KdScDKxVSI?si=YfTKDy-rqBNDyxuL

[stroke]

https://youtu.be/Am8j1Zw5KrE?si=vNtYXL07EUwK5QfY

[jimlosaltos]

https://youtu.be/Am8j1Zw5KrE?si=vNtYXL07EUwK5QfY

Great find. Thanks !

[doctorhl]

An observation along these lines: those hitting with long extension at contact ( like Federer), seem to have Iess angular momentum and dont rise up and piroette up on their toes quite as much as those with short extension at contact. Just a style variation. Not sure when the piroette becomes counterproductive because of workload.

[jimlosaltos]

https://youtu.be/Am8j1Zw5KrE?si=vNtYXL07EUwK5QfY

One of Sinner after impact on a running forehand, extending ( bent arm variation) with off arm tucked.

filedata/fetch?id=107164&d=1747091146&type=thumb
From Indian Wells, BNP Paribas Open 2023 (c)jfawcette

[jimlosaltos]

And here is Fed extending after impact. Although he's certainly not tucking his off arm. I think he is extending it for balance at this point.


filedata/fetch?id=107166&d=1747091376&type=thumb
From Laver Cup Chicago 2017 (c)jfawcette

[jimlosaltos]

Heck, since the presenter in stroke's vid mentioned Alcaraz, let's drag him in as well.

filedata/fetch?id=107168&d=1747091657&type=thumb
From Indian Wells, BNP Paribas 2023 (c)me