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The service motion, like the baseball pitch, involves sub-motions that result in very pre-stretched muscles that can be used for ISR. If ISR is not a significant part of the OP's serving technique, these muscle stretching sub-motions like the racket drop can be left out. ISR was missed by...

Anyone interested in video analysis of tennis strokes should start with the forehand and not the serve, which is much more complicated throughout the entire service motion. The tennis serve is very similar to a professional baseball pitch biomechanically. The forehand is simple. You can...

I did not know that I had a Waiter's Tray, as I practiced serve for about 35 years. I wish that someone had told me this stuff in the 1970s...................................................................................................................

If you do not want to post your videos on the forum, you can use the forum "Conversation" feature and communicate with another forum member that you know. For "Conversation" see above, the envelope icon. ( You can't have a "Conversation" with yourself on the forum.) You could coach a team...

Instead of streaming Youtubes, if you have the videos on your computer, you can do video analysis and compare videos side-by-side using Kinovea. It is not so easy as using Youtube on the forum, where Youtube streams ATP tennis strokes to you and provides single frame advance. But for videos...

As you can see, 240 fps is adequate for tennis stroke analysis and much slower recordings are misleading for you and waste everyone's time. The times of our lives.

Follow the same instructions in the post above.

Single frame these videos so that you see three consecutive frames recorded at 240 fps. To single frame on Youtube, use the period & comma keys. Set the middle frame closest to impact. Then the other 2 frame before and after impact. To select a video so that the video does not start...

You can compare Youtubes frame-by-frame one above the other right in this post. This is the most powerful way to compare tennis strokes. You may not know the details, the strokes or biomechanics but you can see differences between your strokes and ATP strokes. Unfortunately, other stroke...

Needs video. The majority of active tennis players do not rotate the upper arm bone using twitch-like Internal Shoulder Rotation (ISR). Most have no idea of the high level serving technique as used in the ATP. This is all seen in every video of an ATP server. To single frame on Youtube...

I base my comments on the high level serving technique as used in the ATP and seen in high speed videos. I consider that the only high performance serving technique. Others might have a different serve technique standard.

You have a Waiter Tray serving technique. Forum Search: Waiter's Tray Serve Member: Chas Tennis Forum Search: Internal Shoulder Rotation Member: Chas Tennis Forum Search: Ellenbecker Rotator Cuff Injury ..Chas Tennis Pat Dougherty "Hammer that Serve" Is a Youtube on improving the...

The big change was from high speed filming camera, that required very expensive cameras, buying film and paying to have it processed. That VS digital cameras that recorded and cost almost nothing to record tennis strokes. That high cost of film cameras kept nearly all average tennis players...

This is not a new problem. https://en.wikipedia.org/wiki/Tower_of_Babel

We were born to see the explosion of the information age. When discussing the biomechanics of tennis strokes, defined joint motions are clear and not ambiguous. Elbow Extension. Using this same word - that is already widely used in a defined way in science to discuss tennis strokes - and then...

In English, the word "extension" is being used for defined joint motions. Technical and academic fields define terms so that communications work better and terms are not ambiguous. https://en.wikipedia.org/wiki/Anatomical_terms_of_motion Well down in this long Wikipedia article, under...

In English, the word "extension" has been taken by the defined joint motions. Elbow extension can be searched on Google and Youtubes and can be found showing how to measure elbow extension. Look down to see defined Extension. https://en.wikipedia.org/wiki/Elbow This forum has evolved so...

There are two usages of the defined terms for joints. Both are used even in technical publications. #1) Elbow Extension - Position of the elbow angle. For example, The elbow is extended at -5 degrees (or flexed by 5 degrees) . There is a defined 0 degrees, see video. Measuring position...

The only high level serving technique, that I have found, is the one used in the ATP. It is based on Internal Shoulder Rotation. A lot of information is widely available on the technique, as applied, including scientific descriptions. Clear high speed videos exist for everything that is being...

Interesting Nicolas Jarry serve posted in 2018. To single frame on Youtube, stop video, go full screen and use the period & comma keys. Jarry had (or has?) a serving technique where he sort-of starts the motion with the racket up and by the time he gets it back he seems to have a lot of...

The most extreme video that I have seen showing Internal Shoulder Rotation. To single frame on Youtube, stop video, go full screen, use the period & comma keys. This video even makes clear the fact that the skin and outer flesh lag behind the bones inside the arm because of inertia. The bone...

The video frame rates are too slow to show ISR, frame rates unknown. Raonic has ISR and it would show in a 240 fps sharp video. OP needs a sharp 240 fps video. Frame #8 is after impact (the tossed ball was struck and moved to the side relative to the background) Many people make a very...

Youtube without pauses. To single frame in Youtube, use the period & comma keys. Note the 134 degrees. Note the elbow angle. Look at the tilt angle of the rotation axis of the chest with Thoracic Extension! All angles are moving during the tennis serve.....always check frame nearest to...

I described how I would start in previous posts. I would optimize the video techniques, so that we know whether we see something or not. That would involve, say, 240 fps recording. 7 frames covering from ISR start to impact is about right for that fastest action. The Raonic frame shows 1...

@Digital Atheist - Nice Sequences. Did you include all recorded frames? Comparing frames closest to impacts. Raonic. we see the angle between Raonic's forearm and racket shaft, especially frame #7. That angle obviously turns Internal Shoulder Rotation into Racket Head Speed. It is the...

You can compare Youtubes, one above the other and frame-by-frame in this forum post. To single frame on Youtube, stop video and use the period & comma keys. I like to start at frames of+ impact and work back and forth. 240 fps with long pauses (play through or use slider. When you select...

Nearly all video cameras use automatic exposure control to select the shutter speed. If the shutter is too slow there will be excessive motion blur. Your video has excessive motion blur that makes details of the racket motion inaccurate, The lighting levels for tennis court lighting is always...

The forehand drive is a 2 phase stroke where the uppermost body - seen by the line between the 2 shoulders - is the first rotation and the arm driven mostly by the shoulder joint is the second rotation. Of course, the first and the second are additive for racket head speed. Since the uppermost...

What is this "the" forehand? or "my" forehand? Of course, videos show that in the ATP there are now straight elbow forehands and there are bent elbow forehands. And I will be the first that can answer when asked, what percent of each? I don't know.

Videos show that the off hand stays on the racket near the throat area as the racket head is lowered. It is often hard to tell from videos if the muscles of a joint are moving the joint or some other thing is also applying forces such as the off hand. That is the case for the 1HBH with Eastern...