He demonstrated a few moves, and Lu Aiai frowned and said:
"From the perspective of fluid mechanics and anatomy, in order for a tennis ball to reach its highest initial velocity, your brachioradialis, deltoids, and pectoralis major muscles need to exert force. Feel for yourself and see if you've exerted enough force."
Chen Ya was a little stunned. If he didn't have some knowledge, he wouldn't understand what Lu Aiai was saying.
He tentatively moved his right arm, feeling the muscle group that Lu Aiai mentioned, and seemed to understand what she meant.
Although what Lu Aiai said was useful, the way she expressed it was a bit annoying.
Chen Ya also said in a professional tone:
"I've seen a tennis player use her wrist muscles, core muscles, and lower limb muscles when she serves. Wouldn't that be more efficient?"
After hearing what Chen Ya said, Lu Aiai did not show an expression of admiration as Chen Ya had expected.
Instead, she sighed deeply and pressed her nose and eyebrows, looking helpless.
"I previously conducted an experiment investigating the muscle groups involved in a powerful tennis serve. I told subjects the landing point range for the powerful serve in advance and used a wireless Delsys surface electromyography system from the United States to collect surface electromyography signals during the serve. Two high-speed cameras were synchronized to record the action and the landing point of the serve, while also measuring ball speed. The analysis actions were selected as those with the highest ball speeds in the inside corner, middle, and outside corner, with all three speeds being consistent. The analysis phase was the hitting phase, which started with the back scratching and ended with the ball hitting the ball. The analysis metric was the root mean square amplitude, and a one-way analysis of variance using SPSS software was performed to analyze the differences in muscle force characteristics during the hitting phase for the three landing points. P < 0.05 indicated significance, and P < 0.01 indicated highly significant... The conclusion was that there were no significant differences in the force exerted by other muscles involved in the powerful serve at different landing points."
Chen Ya was stunned by Lu Aiai's words for a moment, and his mind started to wander halfway through.
"I'm sorry, could you please explain the conclusion in a more concise way?"
"Didn't I just say that?" Lu Aiai said, "There's no significant difference in the strength of other muscles involved in serving with power at different landing points. In other words, the main factors that determine where your ball lands are the three muscle groups I just mentioned."
She seemed very professional, so Chen Ya modestly asked, "Then, how should I exert force to achieve the most standard?"
Lu Aiai frowned and thought for a moment before saying, "This is your first time playing tennis. I originally wanted to give you a direct experience of the sport so you could develop a basic understanding before delving deeper into it. This is also in line with the general principles of understanding things, but..."
"but?"
"But you're the first person in all these years who's still curious enough to talk to me after listening to what I just said, so I might as well explain the exercise method to you in scientific terms."
For a moment, Chen Ya suddenly felt that this girl was a bit pitiful.
She is probably the type of mad scientist.
However, he could also understand the feelings of her classmates.
Lu Aiai explained, "A powerful tennis serve involves explosive force, essentially prioritizing large muscles. While the size of muscles recruited in the kinetic chain varies, the large joints are always mobilized first. Under certain circumstances, the size of each muscle recruited can reflect the force applied by each segment of the body during the stroke... Therefore, the fundamental movement remains the same when serving a powerful serve from different landing points: the force is transmitted upwards, with a final "whipping" action. However, the specific mechanisms behind this require further study."
After saying so many words in one breath, Lu Aiai felt a little thirsty, but she still asked with concern: "Did you understand?"
"I understand about half of it, but you don't need to continue explaining."
Lu Aiai didn't seem annoyed after hearing this. Instead, she nodded seriously and said, "You understand half of it. You're quite perceptive, much better than the other students in the tennis club."
"Uh, have you ever considered that maybe it's not a problem with their understanding, but rather... uh, a problem with the way you express yourself?"
"What did you say?"
"Nothing."
Chen Ya recalled Gu Yuqing's actions, and verified them with what Lu Aiai said about "highly theoretical things", and suddenly he had an epiphany.
Gu Yuqing's physical fitness is different from his.
Gu Yuqing's strength is much smaller than his, and there is a lot of burden on her chest, so her movements are definitely not the most optimized.
If you want to play tennis well, of course you can't copy Gu Yuqing's movements exactly, but you need to optimize them according to your own physical conditions.
After thinking this through, Chen Ya silently raised his racket.
"Bang!"
The tennis ball was hit hard and flew away, and in the next second, it appeared on the net at the end of the opposite court.
Chen Ya walked over, stretched out his fingers, and used a lot of strength to pull out the tennis ball that was deeply embedded in the wire mesh.
If the court wasn't surrounded by barbed wire, who knows where his ball would have flown to.
On the side, Lu Aiai's applause was heard.
"Excellent! You've applied theory to practice so quickly. Based on my rough observation just now, your batting efficiency has increased by between 12% and 19%."
Chen Ya turned around and smiled, "Thank you. Are you interested in playing a game with me?"
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