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Just for an example:
Forehand:
- Be fluid through the shot
- Turn body sideway on preparation
- Hit in front of your body
I think everyone can pretty much agree on those.
- Fluid - is there a definition for fluid in a tennis stroke? Do we know anything about the biomechanics of 'fluid'?
- "sideway" - is this a basic, do you mean the upper body only?
- "in front of the body" I think that some use 'in front' to mean closer to the net but others could mean literally more in front of the body. Or some part of the body if it is twisted.
If, instead, you use words plus images and videos the communication can be much clearer.
If you said 'Be fluid through the shot as in this high speed video' and always show the video communication is likely to be much better. If the term 'fluid' conveys any meaning you should be able to see it in videos. (Hana Mandlikova was the most fluid and graceful player that I have ever seen. But you had to see her in person for the full effect.)
A few words alone are poor for describing tennis strokes. Words just don't contain enough information to describe complex tennis strokes. Often they are misleading.
Two of the inadequate words are 'the basics' and 'the fundamentals'. These words are often used to refer to a mysterious body of information that really is not known by the user and that you can't Google.
For the closest to the 'basics' or 'fundamentals' see the reference books
Biomechanics of Advanced Tennis, 2003, B Elliott, M. Reid, M. Crespo.
Technique Development for Tennis Stroke Production, 2009, same authors
I like these descriptions of tennis strokes and their biomechanics.
Unfortunately, the ITF Store must have run out of its copies and now the prices have gone up 400% over the price of a few years ago. These books are much longer than a forum thread but
all the information is by tennis biomechanics researchers, so that the percentage of true information is much higher than on the forum.
In the 1970s, I read the 'basics' and 'fundamentals' over and over, perhaps hundreds of times. I still have most of the books. I remember one 'It's the weight that makes the ball go.' It was confidently presented as deep wisdom. I did not quite understand, but I believed! When it comes to the stroke details that anyone can learn today, so much of that 1970s information - UGH!!
From the 1970s to 1995, how the serve worked was still not correctly identified. More scientific examination of a high speed films of a serve would have shown ISR. It's clear in a high speed film of a server, Gerald Paterson, in 1919! But the 'basics and fundamentals' seemed to be well established in the 1970s............
Kinetic Chain - another misleading term to cover much that is not understood - has a limited use but it is a blind alley for understanding tennis strokes. Stretched muscles are critically important. But what does the Kinetic Chain Concept tell you about stretched muscles? Are you drawing a blank? Stretched muscles are all swept under the rug in the Kinetic Chain Concept of speeding up body parts ........