Physical education, sports, and health are important learning programs in students' formation of physical fitness. The primary purpose of physical education is to utilize physical activity to achieve students' cognitive, affective, and psychomotor aspects (Iswanto & Widayati, 2021). One of the sports developed in schools is athletics. Athletic sports in physical education facilities include strength, endurance, speed, agility, and others. In essence, athletic sports are sports in which there are elements of jumping, running, and throwing. Researchers will examine jumping numbers because jumping is one of the most important parts of human movement besides walking and throwing (Mustafa & Dwiyoga, 2020). One of the styles often used in long jump learning at the junior high school level is the squatting style.

The long jump number is defined as the skill of jumping as far as possible by moving the body to each predetermined point (Sukirno & Pratama, 2019). One of the successes in doing a long jump depends on several main stages: the prefix phase, flying in the air, and landing (Riyanto, Simanjuntak, & Haetami, 2018). Correctly mastering the long jump technique will result in a much more effective jump. This can be achieved if supported by a jumper with excellent physical condition; it can produce maximum jumping results (Muzakki & Alficandra, 2023).

Success in performing a squat-style long jump, in addition to factors from technique, there are physical aspects that also influence support of the long jump. Physical conditions, including the long jump number, are needed for technical skills or physical abilities (Rahyubi, 2017). Some factors related to squat-style long jump performance include speed, flexibility, endurance, leg muscle power, and leg muscle explosiveness (Setyawati & Hartini, 2018). Other important factors, namely body anthropometry, such as limb length, are one aspect of the field that makes a meaningful contribution (Purnomo & Nurrochmah, 2023).

In the athletic sport of long jump numbers, the prefix phase is strongly influenced by the length of the limbs and the maximum explosive power of the leg muscles in achieving maximum jump results. Since the leg is the primary driver in the long jump, athletes must have a leg in good condition. The longer the limbs of an athlete, the greater the potential to achieve a longer jump. The leg length and strong repulsion can significantly increase the jump's distance, allowing maximum jumping results (Ishak et al., 2023). In addition, long jumps require leg muscle explosiveness or explosive strength in the legs to produce maximum repulsion (Zikri, Ramadi, & Juita, 2019). Leg muscle explosiveness is the ability of each individual to optimize maximum strength quickly. It can be concluded that if you only have strength without harmonizing speed, the explosive power will not be optimal. Explosive strength of the leg muscles has an important role in determining success in the long jump because the prefix phase must be carried out at high speed, which is then maintained stably until it reaches repulsion (Lesmana, Ridwan, Donie, 2020).

At State Junior High School 1 Turen, Malang Regency, squat-style long jump material is taught in the Merdeka curriculum as part of physical education learning. This curriculum emphasizes the development of students' competencies and potential according to their characteristics. Learning is directed not only to master basic techniques but also to understand body functions in physical activity. Therefore, variable leg length measurements and leg muscle explosiveness are important because they help teachers assess aspects of students' physical fitness that support squat-style long jump performance.

The previous research discussed the factors that affect long jump performance. However, most of these studies have not specifically examined the relationship between leg length and leg muscle explosiveness with squat-style long jump performance. The study by Hasbunallah (2018) found a significant relationship between leg length and leg muscle explosiveness in long jump results in junior high school students, although it did not explain the jumping style used in detail. Furthermore, according to Darlis & Rahmadani (2023), leg muscle explosiveness significantly contributes to long jump results, but the study did not consider leg length or the use of squat-style long jump. Meanwhile, a study by Hasruddin (2019) revealed that leg muscle explosiveness significantly affects long jump performance, but it has not been studied simultaneously with the variables of leg length and squat-style long jump techniques. Based on this description, studies examining the relationship between leg length and leg muscle explosiveness with squat-style long jump are still limited, so further research is needed in the literature.

Based on the explanation above, this study examines the relationship between leg length and leg muscle explosive power and the ability to squat-style long jump. From the results of the researcher's interview with the corner teacher at State Junior High School 1 Turen Malang Regency, some students have difficulty landing and repulsion, which is not optimal. Difficulties in the repulsion phase that are not maximized cause a lack of forward thrust of the body. Therefore, it is necessary to carry out assessment actions through relevant research related to these problems through research entitled "The Relationship Between Limb Length and Limb Muscle Explosive Power with Squat-Style Long jump performance of Class VIII Students a State Junior High School 1 Turen Malang Regency".

The results of the study were tested with inferential statistics, so first conduct prerequisite test testing including: 1) data normality test analysis results, 2) homogeneity test, 3) regression line linearity test and hypothesis testing which includes: 1) correlation test between variables, 2) multiple correlation test, 3) multiple regression test, 4) effective contribution and relative contribution.

The normality test (Table 1) was analyzed using the Kolmogorov-Smirnov technique, using the significance of the value of the independent variable limb length obtained by Sig. P = 0.567 > α 0.05, the independent variable of leg muscle explosive power obtained Sig. P = 0.507 > α = 0.05, and on the dependent variable, the squat-style long jump performance obtained exact Sig. P = 0.492 > α = 0.05. This means that overall, the data from the three variables have a normal distribution.

The results of the homogeneity test (Table 2) using the Levene technique are presented with data that has been converted in the form of standard Z-score values. Data were analyzed using the ANOVA technique. The results of the homogeneity test analysis on the variable of leg length and leg muscle explosiveness with the variable of squat-style long jump performance obtained the results of the Sig value. 0,933 > a 0,05. Conclusion Based on the data exposure obtained, the group variant results come from homogeneous data.

The linearity test results presented in Table 3 show that there is a linear relationship between each independent variable, namely leg length (X₁) and leg muscle explosiveness (X₂), with the dependent variable, namely squat-style long jump performance (Y). The Fcount value for the limb length variable on squat-style long jump performance is 1.410 with a significance value (Sig. F) of 0.224, while the limb muscle explosive power variable on squat-style long jump performance is 1.445 with a Sig value. F value of 0.255. Because both significance values are greater than α = 0.05, it can be concluded that the relationship between each independent variable and the dependent variable is linear. Thus, the analysis model fulfills the linearity assumption and can be continued at the linear regression analysis stage. So, it can be concluded that leg length and leg muscle explosiveness with squat-style long jump performance are linear.

A single correlation test using Pearson's product-moment correlation analysis (Table 4) shows a positive and significant relationship between the independent and dependent variables. The correlation between leg length (X₁) and squat style long jump performance (Y) obtained a coefficient of r = 0.777 with a significance value of p = 0.001 (p < 0.05). Furthermore, the relationship between leg muscle explosiveness (X₂) and squat-style long jump performance produces a coefficient of r = 0.769 with a significance value of p = 0.001 (p <0.05). The data show that the longer the limbs are and the greater the explosive power of the student's leg muscles, the better the ability to perform a squat-style long jump. Thus, variables X₁ and X₂ have a strong and significant linear relationship with variable Y. However, it should be noted that although this relationship is significant, other factors outside the research model can also affect students' squat-style long jump performance.

The r-test results obtained 0.829, Sig. F = 0.000 and α = 0.05 (Table 5). Because Sig. F is smaller than α = 0.05; it means that there is good and linear continuity between the length of the limbs and the variable explosive power of the leg muscles with the ability to long jump squatting style of students in class VIII State Junior High School 1 Turen Malang Regency. The coefficient of determination analysis results shows an R2 value of 0.687 or 68.7%. This shows that leg length and leg muscle explosiveness can explain 68.7% of squat-style long jump performance. Factors outside the research model explain the rest.

The results of the further test analysis of the F test results obtained Fcount = 42.844 Sig. F = 0.001, means Sig. F < a 0.05 (Table 6), it can be concluded that leg length and leg muscle explosiveness are positively and significantly related to the ability to squat-style long jump. Below are presented the results of the analysis of the constant coefficient, (a) regression coefficient, which includes regression for X1 (b1) and regression X2 (b2). Each coefficient is presented as follows.

The multiple regression coefficient analysis results obtained regression coefficient ba1X1 = 0.460 and regression ba2X2 = 0.428 and constant-coefficient = 5.571. Based on the thick regression coefficient (Table 7), the regression equation line can be formulated as follows: Ŷ = (5.571) + (0.460X1) + (0.428X2) so that it can be used to interpret the effect of squatting long jump performance.

The results of the analysis in the Table 8 show that the length of the limbs contributes to the effectiveness of 35.7% and the explosive power of the leg muscles contributes to the effectiveness of 32.9%, while the relative contribution to the length of the limbs and 52.0, the explosive power of the leg muscles is 47.9. Together, the limbs' length and the leg muscles' explosive power amounted to 68.7%.

Based on the results of data analysis, it can be concluded that leg length and leg muscle explosiveness have a significant relationship with squatting long jump performance in class VIII students of State Junior High School 1 Turen. Leg length and leg muscle explosiveness play an important role in supporting the repulsion movement, hovering in the air, and landing in long jump activities. Although the students in this study are not athletes or learners with competitive goals in athletics, the study's results are still valuable for physical education learning. Every student can improve their long jump performance by understanding the correct technique and optimal use of their physical abilities.

Thus, the results of this study can be the basis for physical education teachers in developing practical and adaptive long jump learning models. A learning approach that considers students' physical characteristics will help improve movement skills. Based on the results of this study, it is recommended for further research to conduct further studies by considering the addition of variables such as speed, flexibility, and confidence levels that affect the achievement of squatting style long jump results.

The authors would like to express their sincere gratitude to the principal, physical education teachers, and State Junior High School 1 Turen, Malang Regency students for their cooperation and active participation in this study. We also thank the Faculty of Sport Science at Universitas Negeri Malang for the academic support and facilities provided throughout the research process.

The data supporting the findings of this study are available from the corresponding author upon reasonable request. All data were collected and analyzed by ethical standards and are stored securely by the research team.

This research was conducted independently without any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

The author hereby declares that this research is free from conflicts of interest with any party.