SPECIAL PHYSICAL TRAINING FOR STRENGTHENING ATHLETES’ PHYSICAL FITNESS AND SPORTS ABILITY

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INTRODUCTION
Tennis is a skill-led antagonistic event.The event is a ball game in which 2 or 4 people hold rackets and hit a small elastic rubber ball back and forth across the net.Tennis matches are highly antagonistic.It requires athletes to have good speed, strength, endurance, flexibility, and other physical qualities.Good exceptional physical fitness is an essential prerequisite for tennis players to win the game.For tennis players, the performance of specific physical fitness is important, but functional performance cannot be ignored either.Functional action screening (FMS test) includes a series of action pattern tests.Studies have shown that if athletes score less than 17 in the FMS test during the competition period, the probability of their lower limb's sports injury will increase by 4.7 times.If male tennis players use incorrect movement patterns to control their bodies for a long time, knee injuries will become extremely common.For this reason, this study mainly explores the relationship between the functional performance of male tennis players and the performance of specific physical fitness. 1 Optimize the functional training and physical fitness training system for male tennis players to provide references for tennis players' scientific training and efficient training.

METHOD Research object
The research object is a male tennis player of a tennis team.The number is 6 people.The sports grades are all national athletes.Age= (21.25±2.38)years old.Height= (186.75±7.46)cm.Body weight= (80.75±7.07)kg.The exclusion criteria for the study subjects are as follows: the athlete has had an acute sports injury within one month before the test.Athletes who cannot participate in regular training and competitions due to long-term chronic sports injuries.

FMS test
The functional movement screening (FMS) test consists of 3 exclusion tests and seven basic movement pattern tests.The seven basic action mode tests are squat, hurdle step, front and rear split squat, shoulder flexibility, active straight knee lift, trunk stability push, and trunk rotation stability.The total test score is 21 points. 2The scoring standard is divided into four levels.That is "0-1-2-3".
The subjects completed the above seven actions as required.Do each action up to 3 times. 3On-site, a professional, will score on-site according to specific scoring standards and make records.The higher the total score, the better the functional performance of the subjects.
Tennis specific physical fitness performance test 1.10m×4 turn-back run.We place marker buckets at the two endpoints of 10m.When the athlete heard the start command, he quickly sprinted forward and touched the sign bucket with his hand.Then they ran the two back and forth at the fastest speed and recorded the elapsed time. 4. T-type test.We put the logo bucket into a T shape.After the test started, the subjects started listening to A's command, ran to B, touched B with their right hand, and then slid to C. The athlete touches C with his left hand and then slides to D. The athlete touches D with his right hand and then slides to B. The athlete touches D with his left hand and runs backward back to A. 3. Throw a solid ball with a swing forehand.The athlete prepares for a forehand and holds a 5kg solid ball in both hands.Then they bend their knees and squat, turning their bodies to the right to guide the solid ball backward.Then the athlete quickly kicked his leg and turned to throw a solid ball straight ahead.We measure the point and distance of the solid ball.

Calculation of the independent variable of athlete's endurance
The article uses an artificial fish school algorithm to optimize the BP neural network's initial value weights and thresholds and then builds the athlete's endurance prediction equation.The specific steps are detailed as follows: Assuming the count on the three-axis of SA, CA, VA, we use formula (1) to obtain the comprehensive count VM ankleo of the athlete's ankle acceleration in tennis.
ξ y represents the changes in the power, frequency, and speed indicators of the athlete during the tennis process.φ represents the standard deviation in each indicator.We define the ankle joint acceleration comprehensive count VM ankleo obtained by formula (1) as an independent variable in predicting athletes' endurance.The article uses a formula (2) to extract the characteristics of the exercise load of tennis players.
[y -y o ] represents the average absolute error of the tennis player's endurance.d i represents a steady sequence of increasing endurance of tennis players.The article uses a formula (3) to obtain the relationship and closeness between adjacent variables in the athlete's endurance prediction time series.( , ) ( ) ( ) ( ) 1.A t1 , A t2 represents the observed value of variable A at time t 1 , t 2 .k represents the time interval between two variables.Determine the number of hidden layers of the BP neural network represented by c. 2. The article uses the formula (4) to define the distance between two artificial fish.
ɷ k0 represents the threshold of the k hidden layer neuron.ɷ kh represents the connection weight between the h input neuron and the k hidden layer neuron.ʋ 10 represents the threshold of the l output neuron.ʋ 1k represents the connection weight between the k hidden layer neuron and the z output neuron.
3. Foraging behavior.Suppose g i represents the current state of an artificial fish.h i stands for food concentration.h j ≤ h i represents the food concentration of another artificial fish school in the g i line of sight area.The random movement of g i one step can use equation ( 5) to express the threshold learning of its next state.

R(n)
represents the random number in the interval [0, n] n represents the maximum step length of artificial fish movement.ʋ 1k (i) represents the current state threshold of g i .
4. Group behavior.Assume that p i represents the number of partners within g i the full line of sight.We use formula (6) to form a set.

{ | } ( 1)
5. Rear-end behavior.Assume that φ represents a given artificial fish position threshold.Then we use equation (7) to calculate the state where g j is not crowded and has a lot of food.
,max ( ) ( ) ( 1) 6.We set up a bulletin board for recording the optimal state of artificial fish.We use formula (8) to construct the prediction equation of athletes' endurance. ,

Statistical processing
We use SPSS20.0software to process the data.The article makes descriptive statistics on tennis players' age, height, weight, FMS test scores, and specific physical fitness performance tests.The article uses Spearman's correlation to analyze the correlation between tennis players' FMS test scores and their specific physical fitness performance.

Analysis of FMS Test Results and Functional Movement Ability of Men's Tennis Players
It can be seen from Table 1 that the average FMS total score of male tennis players is 16.38 points.This is 14 points above the threshold of high risk of sports injuries.This indicates that the overall level of the tennis player's functional performance is good, and the risk of sports injury is not high.

Results of physical fitness tests for male tennis players
Table 2 shows the average and standard deviation of male tennis players' seven special physical fitness performance tests.Studies have proved that coaches can use special physical fitness performance tests to determine an athlete's current competitive level and training effectiveness. 5It can become an essential basis for establishing a training effect evaluation system for certain specific sports.Forehand swing throwing, backhand swing throwing, and head swing throwing tests are the rapid power of tennis players' specific strength qualities.For tennis players, flexible and fast steps are essential.According to the needs of tennis footwork, we chose the T-shaped test and the hexagonal jump test. 6hey can evaluate the agility of tennis players' footsteps from different aspects.The fan-shaped run and the 10m×4 turn-back run test combine the needs of actual tennis and competition.This is used to evaluate the fast-moving ability in the athlete's speed quality.

Correlation between functional performance and specific physical fitness of male tennis players
As shown in Table 3, there is no significant correlation between the total scores of male tennis players in the FMS test and the results of the seven special physical fitness performance tests.This shows that there is no correlation between functional motor ability and specific physical fitness performance.

DISCUSSION
During the test, the athletes made mistakes such as visibly shaking their bodies and maintaining a balance between their trunks and planks.This indicates that these athletes have limited flexibility in the hip and spine and poor reflex stability in the trunk and core parts of the body. 7he shoulder flexibility test mainly evaluates the flexibility of bilateral shoulder movements.Studies have shown that the difference in muscle strength between the left and right sides of the athlete reaches 15%.This is clinically diagnosed as muscle strength asymmetry and sports injury risk. 8he hurdle-over-step action mode mainly evaluates the functional compensatory action and asymmetry of the lower limbs.We combine the two action modes of hurdles and shoulder flexibility to scientifically diagnose the athlete's upper and lower limbs. 9ome wrong actions and low-scoring actions in the FMS test are specific manifestations of poor functional motor ability. 10Therefore, in sports training, coaches should attach great importance to the shortcomings and deficiencies of athletes' physical motor function capabilities, adopt appropriate strength training and flexibility exercises to prevent sports injuries, and use physical motor functions in a targeted manner.Training to improve and improve the functional performance of athletes.

CONCLUSION
Male tennis players have higher overall functional and movement capabilities.Male tennis players score relatively low in

Table 1 .
Results of screening test for functional movements of male tennis players.(x ± s).

Table 2 .
Superior physical fitness performance test results of male tennis players.(x ± s).

Table 3 .
Correlation between total scores of male tennis players' FMS test and specific physical fitness test.