Improving the Endurance of the Lower Body Muscles Strength with the Application of Chair Media to Athletes Long Distance Running Numbers of KONI in Depok City

This study aims to increase the endurance strength of the lower body muscles with the application of seat media to athletes who run long distance running numbers in Depok City KONI athletes. The research sample was 30 athletes from the Depok City KONI Platda who were members of the team for the preparation of the 2022 Porprov preparation. The method used was quantitative with the type of action research, research data was collected using planning techniques (plan), action (action), observation (observe), reflection (reflect). then analyzed quantitatively. The technique of collecting data by testing and measuring the endurance ability of the lower body muscles using the leg press test. The data analysis technique used was the t test at a significance level of 5%. The results of the study explain the training methods used to increase the strength of athlete's muscle endurance including: 1) standing and sitting on a chair with additional weight from the outside such as dumbbells or plates, 2) bridging exercises or lifting the waist with a footstool against a chair, and 3) Performing sit and stand on one footstool. The endurance of the athlete's lower body muscles increased in the third cycle, by means of regular and varied mentoring methods carried out by the coach and using maximum corrective feedback to train the athlete's achievement motivation