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    A year later, my serve still sucks.

    https://en.wikipedia.org/wiki/List_of_internal_rotators_of_the_human_body#Muscles "The muscles of internal rotation include: of arm/humerus at shoulder[1] Anterior deltoid muscle Subscapularis Teres major Latissimus dorsi Pectoralis major " Sometimes the anterior deltoid is missing in lists...
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    Where am I losing power?

    Waiter's Tray Error http://www.hi-techtennis.com/serve/big_l_student.php This has been discussed many times on the forum since the majority of active tennis players serve with a Waiter's Tray technique without much internal shoulder rotation (ISR). Search: Waiter's Tray "internal shoulder...
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    Why can't I get lateral spin on my (tentative) kick serve ? (With video)

    In videos, high level players toss the ball to where they want to impact it. At toss release, the head is low and back, not near impact. For the kick serve, they move consideably so that their heads are about under impact but that is at a later tiem than the toss release. So the instruction...
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    A year later, my serve still sucks.

    Interesting picture. For the serve, the main muscles of ISR are the pec and lat. Before ISR occurs, the triceps muscle straightens the arm rapidly. Of course, that is on the right side of Sampras's body. I can't think of the job the biceps performs. ..........? ISR - internal...
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    "Myth of hitting around the ball"

    I have found nothing observed about the tilt of the racket for the kick serve impact. Rod Cross & Lindsay showed the contact point on the ball in a drawing but I have not seen videos presented and describing the tilt. The top spin forehand drive has been well documented as closed 5-10 d or so...
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    ATP serve net clearance?

    Physicist and tennis researcher Rod Cross has done a lot of work on tennis ball trajectories. He also has written reference books. Technical Tennis is one. Here is Chapter 42 on the tennis ball trajectory. The Physics and Technology of Tennis, Brody, Cross, Lindsay...
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    How to improve concentration (on serve and ground strokes)?

    Serve misses out wide and misses out high or low are likely to have two different technique causes. How does he miss serves? First, use high speed video to determine his serving technique. If high level technique with significant speed from internal shoulder rotation (ISR) - 1) for high or...
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    Why can't I get lateral spin on my (tentative) kick serve ? (With video)

    With slow video, 30 or 60 fps, the fastest part of the serve and hardest to see is the internal shoulder rotation (ISR) that might indicate that the serve is a high level technique or not. I can't see what is happening with only one or two frames (of ISR) in the last 30 milliseconds before...
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    Why can't I get lateral spin on my (tentative) kick serve ? (With video)

    I think that a ball should be tossed to where you want to impact it for your particular serving technique. I have not see the limitations described on how the toss should be performed for each type serve. The Murray toss shows that a J toss works for what appears to be a flat serve. Kick...
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    Why can't I get lateral spin on my (tentative) kick serve ? (With video)

    Toly had picked up that Murray had a J toss. He has a post or thread comparing Murray and Dogopolov.
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    "Myth of hitting around the ball"

    What is your point? That collisions are complicated and require more than a single piece of information to describe? It is feasible for average tennis players to get some angular measurements on their tennis stroke impacts by following the directions. They can also observe some of these same...
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    Inconsistent Forehand

    From the side view, it does not look as if you look at the ball near enough to impact. Compare to high level forehands. Federer is a model for intensely looking at the ball. See post #12 above. Djokovic has a bent elbow forehand and his looking at the ball habits are not so precise as...
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    Why can't I get lateral spin on my (tentative) kick serve ? (With video)

    That is an especially good camera angle because, by chance, at 1 sec, the ball after the bounce is going directly away from the camera. It does not go to the right or left in the frame. But the ball before the bounce moves to the left as it moves forward. That is a kick serve bounce. Too...
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    Help Me Out on This Serve

    The majority of active tennis players serve with a technique called the Waiter's Tray. To get speed from a WT technique, the racket must be 'closing' very fast at impact. That can lead to long or short errors as speed is increased. On the other hand, the WT is usually reliable. If you are...
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    "Myth of hitting around the ball"

    The first touch of the ball by the racket in 3D is a plane meeting a sphere. A simpler 2D case is a line meeting a circle. A single camera view of impact is like the 2D case. Work with this calculator a bit until you see that the tangent line represents the racket shaft when the ball is...
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    How long do you hold the Racket with your off hand?

    The slow motion at the beginning seems to show the off arm accelerated forward, to the side and back but not brought in quickly with timing. ? At 1:09 the off arm is brought in (maybe not enough) and maybe the pull in added to the uppermost body rotation speed. ? This looks more like the...
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    Forearm: When To Tuck In The Left Arm?

    Look at a lot of videos of ATP pros that are not pressured and form some simple stats. 1) % of players that tuck the off arm in with purpose. 2) % of players that do not use the off arm with any apparent purpose. Consider some of the circumstances. Don't count players under pressure or...
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    "Myth of hitting around the ball"

    I know of no reference that has information on the racket face angle for the inside-out forehand. I'd like to see high speed video measurement of pro player forehands. Pro forehands yes, poster forehands no. I used my racket work for the inside out forehand in post #84, mainly to...
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    Forearm: When To Tuck In The Left Arm?

    That looks like low intensity warm up or practice shot. What do you think the stats would show for forehands & off arms in a match where Federer was not pressured and wanted to hit pace?
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    "Myth of hitting around the ball"

    I am mostly interested in how the top 100 ATP players impact the ball and their strokes. I like to see one brick at a time - with high speed video observations - put in place. I am struggling to get a new brick settled, that the racket tilts about 13-15 d for an effective kick serve (bounce...
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    "Myth of hitting around the ball"

    Before impact we would like to observe things using the limitations of a single high speed video camera, a capability available to most players. We can place a camera under impact and see this as was demonstrated. This camera angle gives the most important information for "hitting around the...
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    "Myth of hitting around the ball"

    I like 'first touch' because it is about the only thing that can be observed and it does not involve impact complications. There is not any reference that I know of. If the inside-out forehand and the contact-on-the-outside of the ball received some video attention and the resulting shots were...
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    Suddenly, Out of Nowhere, Serving Bombs

    Or, it might also be some things that show in a video......? Try to observe accelerations, especially those that stretch the muscles for ISR.
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    Suddenly, Out of Nowhere, Serving Bombs

    The four milliseconds of impact determine what happens to the ball in tennis strokes. 240 fps catching one frame every 4.3 milliseconds, can give a before, during and after impact frame of this most important part of the serve. If you have a camera that also has a fast shutter speed, video...
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    Offseason tips

    Platform tennis is popular in the Northeast. and some other areas. Most of the courts around Baltimore were in tennis clubs or golf clubs with tennis. The 'platform' part refers to an elevated court usually made of aluminum, where you could lift slats around the courts and sweep off the snow...
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    How long do you hold the Racket with your off hand?

    The off arm is often used for a purpose in the forehand. The off arm can speed up the turning of the uppermost body for adding to racket head speed. First, the off arm is accelerated/turned to the front while being held out high and near straight. (Maximizes the moment of inertia for the off...
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    Good Serve Practice Video

    I had looked into it earlier and finally found an interview where he discussed in detail his lingering back issues over a long period of time. I believe that was from matches from 2013 to 2015, and that he had finally improved before the interview. I could not find the interview last night...
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    Good Serve Practice Video

    From about 2013 to 2015 Federer had a lingering back injury. The above video was posted in September 2015. It is a good idea to always avoid Federer videos that may have been taken in the 2013-2015 period because of the back injury. There are internet sources on the 2013-2015 injury and a...
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    Fixing my volley

    Most active tennis players serve with a Waiter's Tray technique AND also use a similar technique for overheads - without much ISR. Learn to watch the servers at your club or courts, especially when receiving serve from them. You will see the racket facing the sky by eye for the serve. You...
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    Fixing my volley

    Some advice involving the upper arm angle. I think I see what he advocates in pro volleys.
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