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I didn't mean to imply that playing tennis was a mistake, just that spending *all* my free time on tennis was a mistake. You're only going to have a young body/spine that recovers from injuries relatively quickly for a few more years - so I'd suggest learning other skills which might be harder...

For a few years in my twenties I spent all my free time on tennis. On weekdays I'd play for 2 hours from 8pm to 10pm, pick up some food on the way back home, shower eat and sleep. On Saturday and Sunday I'd play both in the mornings and evenings, 2 hours each session. That was about 18 hours per...

I understand that you are likely correct, but I'd be much happier to accept this if I saw a study that simulated a racquet with an accelerating force before and through contact. Especially since I read a study that mentioned that the COR values were higher for (high level) player swings than...

I'm quoting from the paper. "The racket is driven by the drive arm through the throat area instead of through the grip (Fig. 3) to allow for maximum adaptability of the gripping condition." "Before impact, the drive arm is decelerated so that the racket hits the ball in a ‘freely pivoted’...

This paper describes an even more intricate machine commissioned by the ITF to study racquet power in a tennis serve -> https://www.researchgate.net/publication/264121171_A_Tennis_Serve_Impact_Simulation_Machine It has a much more detailed description and clearer pictures than the one from...

Just like good players don't necessarily make good coaches, I doubt good coaches would want to waste their time thinking about matters that their players can't control. Besides, if I had to bother an expert with questions about the effect forces at the handle might have on the collision, I'd...

Here's a pdf version https://www.researchgate.net/profile/Bruce-Elliott-2/publication/16043968_Tennis_The_influence_of_grip_tightness_on_reaction_impulse_and_rebound_velocity/links/54b395f90cf28ebe92e2eccb/Tennis-The-influence-of-grip-tightness-on-reaction-impulse-and-rebound-velocity.pdf The...

I was able to access this study for free as well (not the pdf version, but what looks like a scan of a printed version) -> https://www.researchgate.net/publication/16043968_Tennis_The_influence_of_grip_tightness_on_reaction_impulse_and_rebound_velocity I'm kind of in awe of the lengths they...

I wasn't able to get access to a lot of the individual research papers (they are behind paywalls), but this summary confirms that @Dragy is correct -> https://www.researchgate.net/publication/229900966_The_role_of_the_racket_in_high-speed_tennis_serves Some highlights: "Initial investigations...

Glad to have reduced the differences to something a simple experiment can resolve. I'll get back when I have proof one way or the other.

Err. That question was just for @Dragy . I will edit the post to make that clear. But since you bring up a pool ball 6 times heavier, if you apply the standard formulae for an elastic collision V1f = (m1 - m2) / (m1 + m2) * V1i + (2 * m2 / (m1 + m2)) * V2i V2f = (2 * m1 / (m1 + m2)) * V1i + (m2...

Let me try to understand if there's still some disagreement here. Please answer the following questions. EDIT: These are just for @Dragy Suppose a racquet is suspended by a thread. Shoot a ball at 100 mph at its sweet spot. Just after impact the ball returns at X mph and the racquet moves back...

You seem like a man of logic and science, so I too would like to be on the same page as you. Here's where I think the source of the confusion is. You are likely right that the forces at the handle do not matter for the ball speed relative to the racquet after the collision. But if the racquet...

My love of tennis is not limited to only improving strokes. I also like to know which mental models are accurate and which are just a way to trick your brain into doing the right thing. When I saw the tip about imagining swinging through a soap bubble and found that it helped me, I was curious...

I like this simplification. Clearly there is some disagreement (at least from @Dragy and maybe others) on how forces at the handle affect E for the collision. A simple experiment would resolve this. Drill a cylindrical hole through the racquet handle (from bevel 1 through bevel 5), and stick a...

@Dragy Is this the TWU article you're referring to -> https://twu.tennis-warehouse.com/learning_center/freehandheld.php If yes, that article only compares freestanding to handheld racquets, and explicitly excludes handle-clamped racquets because the force(s) on the handle "prevents translation...

This seems wrong in theory. In theory, it is possible for large forces in the first few microseconds of contact to bring the RHS up to the original swing, after which for the rest of the 5 milliseconds of contact the collision and resulting serve speed should be similar. I've not computed how...

I'm mainly interested in all the forces that can be applied on the handle by the hand which might be capable of compensating for the reduced RHS. The reason I mentioned torque is because I wanted to be clear that I wasn't only asking about the 'net' force. A net force of zero might still produce...

@socallefty @Morch Us @SystemicAnomaly @Chas Tennis and others who've provided links to literature, can you please also attempt to answer my original question based on your understanding of the literature you linked to? Can increased forces at the handle compensate for the 10% lower RHS? If yes...

Do you think the forces at the handle don't matter at all during contact? If someone lets go of the racket an instant before contact (after generating the same RHS), do you think the serve speed would be the same?

This is what I think as well, which is why I'm trying to scientifically determine exactly how much "extra pressure" would be required to make up for a 10% drop in RHS to achieve the same serve speed.

If someone reduces the RHS (leading up to and) during contact by 10% can they achieve the same serve speed by increasing the forces/torque applied by the hand on the handle during contact? If yes, by how much should the forces/torque increase? Does the answer depend on the weight of the racket...

Does USTA Florida not have a regional play off before the sectionals like USTA Eastern does? Having a regional/district playoff would halve the number of teams that go to sectionals, thereby allowing every team to play every other team in the sectionals.

I know this is a really old thread, but are any of you still playing USTA leagues here in Palm Beach county? I filled out the form seeking to join a team on the USTA Florida website, but haven't heard back. Back in Jersey I was a strong 4.0 player, but the rating scale here seems to be a little...

I watched some of your other videos and you don't bend at the elbow early in the follow through like you did when practicing with the topspin pro. So maybe the bent elbow in follow through happens more often when trying to hit with extra arc/topspin.

On the forehands it seems normal for everyone to do it, but on the one hand backhand very few of the pros bend their elbow as consistently as you and I seem to. made me wonder if i'm relaxing the shoulder too early

I've recently noticed that my elbow is bent after contact (in follow through) just like you in above video. Do you have any theories on why this happens and if it's ok? I'm the guy in blue in this video:

after 150 posts of people talking about it without knowing its purpose, we have a new correct answer: this thread PS: And that's a fact!

I also played doubles the day before with a USTA 4.0 captain in SF and two members of his team, and won all three sets (although the scores were a little tighter 7-5 6-4 6-3). Need to find a park in SF where the strong 4.0 or weak 4.5 crowd plays pickup doubles.

Just to clarify, I didn't play with LeeD today. I did play with LeeD's partner (Dave) later and won two sets 6-1 6-1 ; I'm beginning to think west coast 4.0s being stronger than east coast 4.0s is a myth.