## 3 Results  
### Basic Statistic  
The basic descriptive parameters of the subjects in the UHCJ20m, MRLS20m, MRFS20m, and M100m tests were calculated. The results of descriptive analysis (Table 1) show that the average result in the M100m test was 12.97 \(\pm\) 0.54 s, while the fastest result was 11.36 s and the slowest was 14.47 s. The average result in the MRLS20m test was 3.43 \(\pm\) 0.12 s, the fastest result was 3.13 s, and the slowest was 3.74 s. In the MRFS20m test, the subjects obtained an average result of 2.36 \(\pm\) 0.10 s, while the fastest result of the 20 m run from the flying start was 2.06 s and the slowest was 2.72 s. In the last test, UHCJ20m, the average result was 4.41 \(\pm\) 0.32 s, while the best result was 3.70 s and the slowest was 5.25 s. In all four tests, the results of the subjects were homogeneous and did not deviate significantly from the normal distribution of the results. Correlation between Results in the UHCJ20m Test and Results in the M100m, MRLS20m, and MRFS20m Tests  
Although the coefficients of the three simple regression analyses are statistically significant, the greatest correlation was found between the predictor variable UHCJ20m and the results of the MRFS20m and MRLS20m tests (Table 2). The results of the regression analysis showed a statistically significant moderate positive correlation (R = 0.534 and 0.486, respectively), while the coefficient of determination (R\({}^{2}\) = 0.285 and 0.236, respectively) implies that the independent variable explains 29% and 24% of the variance of the dependent variable. Correlation between Kinematic Parameters of the UHCJ20m Test and Kinematic Parameters of the MRLS20m and MRFS20m Tests  
Table 3 shows the descriptive statistics of the kinematic parameters of the tests. The results show that the subjects achieved an average speed (v) of 4.56 \(\pm\) 0.33 m/s in the UHCJ20m test, with the slowest subject achieving 3.81 m/s and the fastest 5.41 m/s. The arithmetic mean of SF was 2.26 \(\pm\) 0.41 str/s, with the lowest being 1.78 and the highest being 4.49 str/s. The average SL achieved in the test was 2.06 \(\pm\) 0.28 m, with the shortest stride being 1 m and the longest stride being 2.87 m. The ground contact time, i.e., the average CT during the amortization and takeoff phases was 193.39 \(\pm\) 25.01 ms, where the shortest average time was 90.89 ms and the longest was 243.63 ms. The average flight time of the subjects (FT) in the test was 259.32 \(\pm\) 34.23 ms. The shortest flight time was 119.33 ms, and the longest was 335.14 ms. The test also calculated the number of steps (SN) required to cover the 20 m distance. On average, subjects required 9.14 \(\pm\) 0.87 strides to cover 20 m. The subject with 7 jumps had the lowest number of steps, whereas the subject with 11 jumps had the greatest number of steps. Multiple regression analysis was used to determine the correlation between the kinematic parameters of the UHCJ20m test and the final results of the M100m, MRLS20m, and MRFS20m tests. Due to the direct dependence of the average movement speed in the UHCJ20m test and the final results in the other tests, this variable was omitted from further analysis. Similarly, due to the occurrence of multicollinearity and to exclude variables