Service in tennis is a very important thing to determine the course of a game, players who often make mistakes in this process tend to experience a lack of self-confidence. Then it results in loss of concentration and unbalanced coordination. Players with fast hand reaction and hand-eye coordination who have high performance in every game. This study aims to determine the effect of hand-eye coordination training on improving the service skills of tennis athletes. The method used in this study is the Experimental method with a Pre-test Post-test Control group design design. The population used was 15 Indonesia University of Education Tennis Student Activity Unit athletes. Sampling was carried out by Purposive Sampling, and the sample numbered 8 people, then divided into 2 groups, namely the experimental group with Hand-Eye Coordination Training and Service Drills and the control group with Service Drill Training. In measuring the skills or accuracy of athletes using instrumentsHewitt tennis achievement test.Service Drill Training with Eye Hand Coordination and Service Drill Training have a significant influence on improving service skills. However, Service Drill Training with Eye Hand Coordination shows better results in improving the service skills of athletes in the sport of Tennis.

Psychological factors are one of the factors that support athlete performance. Therefore, there is a need for psychological training to overcome various psychological problems, especially the concentration and performance of karate athletes. This study aims to examine the effect of imagery training on the concentration and performance of kata karate athletes based on gender. This research uses an experimental method with a post-test only design. The sample used in this research was 10 karate kata Gokasi athletes from Bandung City, consisting of 5 female and 5 male athletes aged 11-13 years. Intensive imagery training was given as a research treatment, where they would imagine detailed word movements with an exercise duration of 10-15 minutes per session, frequency 3-4 times a week for 4 weeks. Measurements were carried out in two aspects, namely concentration using the Concentration Grid Test (CGT) and performance using the jury’s assessment through mini-events. Data analysis was carried out using the SPSS Version 27 statistical test. The results of the study showed that the impact of visualization training on the focus and performance of karate kata athletes, both male and female, varied greatly. Male athletes outperformed female athletes in the concentration variable, while female athletes outperformed male athletes in the performance variable. Thus, it can be said that imagination training is one of the exercises that can be used to help karate kata athletes, both male and female, to be more focused and perform better.