- Abstract: The research aims to analyze the biomechanical and electrical activity of the muscles in various jump performances of jumpers. Procedures The researcher used the descriptive approach, using the tools and means of biomechanical analysis and electrical activity due to its suitability to the nature of the research. Methods: The research community consists of a high jump competitor who was chosen intentionally and participated in the Republic Athletics Championship under 18 years old 2022/2023, registered with the Sporting Sports Club. He is third place in the high jump competition (age 17.3±0.32 years, weight 74.60±0.47 kg, height 187.11±1.03 cm). The competitor made 3 attempts for each training, with a total of 18. The best attempt for each training was chosen and analyzed. Data were collected using Swedish-made Myon Simply Wireless muscle electrical activity analysis system devices to measure the contribution of muscle electrical activity and a force measurement platform (Bertec 4060-10) to measure the lifting force of the lifting leg, the maximum momentum, the time of reaching maximum force, and the speed of force development, and three-dimensional imaging. Using eight cameras at a frequency of 100 frames per second, the biomechanical measurement and analysis process was carried out using the motion analysis program (SIMI 9.02 3D motion analyses) to extract the kinematic variables of the body’s center of gravity and the force measurement platform (FORCE PLATE FORME Bertec4060-10). Results The soleus muscle is one of the strongest and most important muscles in jumping training in general. Despite its size, its importance is shown by the strength of the tendon, as the tendon works with the muscle in a compatible chain through the flexibility and compatibility of both, so the elasticity of the muscle increases as a result of the cohesion and hardness of the tendon. Recommendations: Jumping exercises in their various forms store elastic energy in the hamstrings and tendons, as the hamstrings participate in elasticity and flexibility because they support the change that occurs in the length of the hamstring. Keywords: electromyography