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This study investigates the relationship between leg muscle power and the effectiveness of volleyball smash performance among players aged 16–18 years at Jaya Volleyball Club (JVC) Lubuklinggau. Volleyball is a sport that requires a combination of physical strength, technical mastery, and tactical coordination, with the smash being one of the most decisive offensive techniques. The research was motivated by the observation that many junior athletes at JVC had not yet maximized their smash performance, particularly in terms of accuracy and power, which are strongly influenced by leg muscle explosiveness. The study employed a quantitative approach using purposive sampling with 35 participants selected from a population of 60 athletes. Leg muscle power was measured using the vertical jump test, while smash ability was assessed using a structured volleyball smash test. Data analysis was conducted with SPSS version 23, including descriptive statistics, normality tests using the Kolmogorov-Smirnov method, and Bivariate Correlation analysis (two-tailed). The results revealed a correlation coefficient (r) of 0.652, with a significance value of 0.000 (<0.05), indicating a statistically significant and strong relationship between leg muscle power and smash performance. These findings confirm that explosive power in the legs contributes greatly to the ability of young volleyball players to execute effective smashes. Athletes with higher vertical jump capacity tend to produce more accurate, powerful, and successful smashes, thereby increasing their contribution to team performance. The results emphasize the importance of integrating targeted leg muscle power training into volleyball coaching programs. Coaches and clubs are encouraged to design structured strength and plyometric training regimens to optimize players’ performance. Furthermore, this study provides valuable insights for athlete development programs and contributes to the broader understanding of physical conditioning in volleyball.

This study was conducted with the aim of determining the extent to which leg power training through the box jump method influences the increase in volleyball smash jump height in extracurricular participants at SMK Negeri 1 Kuningan. Volleyball requires good physical abilities, especially explosive leg muscle power, because this skill plays a very important role in performing the smash movement as the main form of attack. One form of training that is believed to be able to increase explosive power is box jump training, which is a type of plyometric training that emphasizes repeated jumping movements with high intensity. The research method used was an experiment with a one group pretest-posttest design. The study involved a sample group consisting of 15 students, taken using a total sampling technique from all volleyball extracurricular members. The data collection instrument used the vertical jump smash test according to Ali Maksum. The test was conducted in two stages, namely before treatment (pretest) and after treatment (posttest). The results of data analysis showed a significant increase after being given treatment in the form of box jump training. This is evidenced by a significance value (p) of 0.000 which is smaller than 0.05, so it can be concluded that there is a real difference between the pretest and posttest results. In other words, box jump training has been shown to be effective in increasing smash height. These findings indicate that training programs designed to incorporate plyometric elements, particularly box jumps, can optimally develop leg muscle explosive power. Therefore, this study recommends that coaches and sports teachers incorporate box jumps as a primary training component in volleyball skills development programs, significantly improving players' offensive performance.

Plyometric training is a physical training method aimed at improving explosive strength and movement speed, which are crucial in martial arts such as silat. This mini-research aims to analyze the effect of plyometric training on enhancing the quality of kicks in silat, particularly in terms of power, speed, and accuracy. The method used is qualitative, involving a plyometric training program over several weeks applied to individuals learning silat, with performance measurements of kicks taken before and after the intervention. The results show that plyometric training significantly improves lower limb explosive power, coordination, and kicking effectiveness. These findings suggest that plyometrics is an effective training approach and can be integrated into physical development programs, particularly to enhance kicking ability.

Plyometric training is an effective training method in increasing muscle power, especially in the lower body which is very much needed in various sports. This study aims to examine the effectiveness of two types of plyometric training, namely Single Leg Hop and Double Leg Hop, on increasing leg muscle power. The study was conducted using a literature review approach to eight previous relevant studies. The results of the review showed that both types of training had a positive and significant effect on increasing leg muscle power. However, most studies concluded that Single Leg Hop training was superior in increasing unilateral strength and specific muscle explosive power, especially in sports such as futsal, basketball, and long jump. Thus, Single Leg Hop training can be recommended as a more effective method for developing lower muscle power, although the selection of training types still needs to be adjusted to the characteristics and needs of athletes.