This study aims to determine the level of leg muscle power, the ability of Mawashi Geri kick, and analyze the influence of leg muscle power on the ability of Mawashi Geri kick among Shorinji Kempo athletes in Bojonegoro Regency. This research uses a quantitative approach with correlational research design. The research sample consisted of 15 athletes who actively train at Dojo Kempo Kodim Bojonegoro and Satlantas Bojonegoro, with total sampling technique.

The research instruments used include Standing Broad Jump and Vertical Jump tests to measure leg muscle power, as well as Mawashi Geri kick skill test with 10 technical assessment indicators. Data analysis techniques used descriptive statistics, simple linear regression test, and hypothesis testing (t-test) with SPSS version 22 software.

The results showed that: (1) The level of leg muscle power of Shorinji Kempo athletes in Bojonegoro Regency is in the moderate to good category, with an average Standing Broad Jump of 187.20 cm (SD=19.038) and Vertical Jump of 51.07 cm (SD=5.133); (2) The ability of Mawashi Geri kick is in the moderate category with an average score of 4.80 (SD=2.678) and shows considerable variation among athletes; (3) There is no significant influence between leg muscle power on the ability of Mawashi Geri kick, with correlation values of r=0.173 for Vertical Jump (p=0.538>0.05; R²=0.030) and r=0.189 for Standing Broad Jump (p=0.501>0.05; R²=0.036), which means leg muscle power only contributes 3-3.6% to the Mawashi Geri kick ability.

The conclusion of this study indicates that Mawashi Geri kick ability is more influenced by other factors such as technique, hip flexibility, neuromuscular coordination, dynamic balance, and core stability compared to leg muscle power. This research recommends that coaches develop a more comprehensive training program with emphasis on specific rotational training, increased flexibility, segmental coordination, and core stability strengthening to optimize Mawashi Geri kick performance.