How to evaluate rotation and direction of opponent's serve and where should eyes be on opponent for better judgment?
1. Evaluation of alternation of receipt and service
Many people can't judge butt rotation badly, for example, they can't appreciate up and down rotation.
(1) Rotate up and down
There should be a clear understanding of how spin is produced, how top spin is obtained and how bottom spin is obtained. The backspin must have two main points. The first pair of balls has downward friction, so direction of force has a downward force, and second can rub against ball near bottom. These two methods can be issued by downward rotation.
If you want to send ball with topspin, firstly there is upward friction so it can come out with topspin. Secondly, ball cannot be rotated (weak topspin) and collision is basic 1. Touch this from back to front. For a ball, this can also be sent without spin, which is also a kind of weak topspin. First of all, you need to deal with topspin and backspin, be it backspin or topspin, if someone else sends a backspin and you hit it, then you will immediately make a mistake by not risking very high or even going out of bounds.
(2) Lateral Spin
Another left and right side spin judgment, you need to know which part of ball you are rubbing against when ball is flying from left side. The ball does not fly further.
Second, serve length estimation
1. Betting range
So when you receive a submission, there's an easy way to rate it. First, you can see how he dribbles racket. The movements it provokes, if we say that movement of starting hand is relatively large and movement of racket is relatively large, then such a ball will be sent at all or will be long. Serve longer and run faster, or ball, if racket is large, ball will be served faster, right, speed is faster, it depends on range of motion.
Another thing to watch out for is range of his arm when he applies force. If he feels that his arm range is relatively small, he usually wants to hit a short ball and his movement ratio is relatively small. .
2. Arm height
Then roll up and down, look at height of his starting hand, if he is going to serve with topspin, height of his starting hand, for example, his forehand, height of his starting hand will not say that he is especially big, right, he It will apply force to body. If this kind of lateral rotation is used, then you will feel that its movements are sucking in and applying force to body, instead of pushing forward or down after pulling out. Yes, look at range of motion.
3. Direction score
(1) Face Orientation
How to judge direction of ball such as side spin, left spin, right spin, you can just see which direction racket is facing after swing is over, it can be judged but can't be said to be 100%.
If you are a master, he can make fake moves. For average golfer, you can look at him in whatever direction his racket is facing after he hits ball. direction it's facing and it won't cause a forward left and right rotation.
(2) Force Direction
Then watch how direction of his force shakes racket. For example, when he pitches ball with side spin from right, from your point of view, he is applying force from left to right to touch ball.
From your point of view, if you apply force from left to right, then if you lift an object, it will move in opposite direction. If you lift it from right to left, you lift it from left.
Liu Baosheng from table tennis net
November 26, 2023
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