## 4 Discussion  
The purpose of this study was to examine and discover the effects of four-week training programs during physical education classes on anthropometric and fitness variables. Combination training consisted of two blocks of training (aerobic, resistance) in each PE class and the volleyball program consisted of isolated skill exercises, small-sided games, and volleyball games. The main findings of our research were that both groups (COM, VOL) significantly improved in selected fitness tests, except for the endurance (beep) test, where only the COM group significantly improved (8.08%). These results confirm the hypothesis that the COM group improved their performance not only in strength but also in endurance compared with the VOL group. Furthermore, the COM group achieved significantly greater improvements in the explosive power of lower limbs (standing long \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Fitness Variables**} & \multicolumn{2}{c}{**Pre-Test**} & \multicolumn{2}{c}{**Post-Test**} & \multirow{2}{*}{**Percentages (\%)**} & \multirow{2}{*}{**\(p\) Value**} & \multirow{2}{*}{**Effect Size**} \\ \cline{2-2} \cline{5-8}  & **Mean** & & & & & & \\ \hline
**Sit ups test (repetitions)** & & & & & & & \\ Volleyball group & 21.40 & 3.74 & 25.90 & 4.50 & 21.03 & 0.001 & r = 0.74 \\ Combination group & 19.10 & 4.81 & 23.10 & 4.39 & 20.94 & 0.000 & d = 0.87 \\ \hline
**Flexibility (cm)** & & & & & & & \\ Volleyball group & 23.60 & 6.71 & 29.10 & 6.00 & 23.31 & 0.000 & d = 0.86 \\ Combination group & 18.80 & 8.14 & 23.40 & 9.95 & 24.47 & 0.005 & d = 0.51 \\ \hline
**Shuttle run 5 \(\times\) 10 m (s)** & & & & & & \\ Volleyball group & 14.70 & 1.20 & 13.30 & 1.13 & \(-\)9.52 & 0.002 & r = 0.59 \\ Combination group & 15.90 & 1.66 & 14.00 & 1.02 & \(-\)11.95 & 0.000 & d = 1.38 \\ \hline
**Standing long jump (cm)** & & & & & & & \\ Volleyball group & 176.0 & 25.99 & 183.5 & 28.30 & 4.26 & 0.001 & d = 0.28 \\ Combination group & 153.1 & 20.69 & 171.9 & 23.92 & 12.28 & 0.000 & d = 0.84 \\ \hline
**Beep test (stages)** & & & & & & & \\ Volleyball group & 58.90 & 21.97 & 61.50 & 23.94 & 4.41 & 0.146 & \\ Combination group & 56.71 & 17.57 & 61.29 & 17.33 & 8.08 & 0.041 & d = 0.26 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Analysis of data for the selected fitness variables from Pre- to Post-test in Combination and Volleyball group. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Fitness Variables**} & \multicolumn{2}{c}{**Pre-Test**} & \multicolumn{2}{c}{**Post-Test**} & \multirow{2}{*}{**Percentages (\%)**} & \multirow{2}{*}{**\(p\) Value**} & \multirow{2}{*}{**Effect Size**} \\ \cline{2-2} \cline{5-8}  & **Mean** & & & & & \\ \hline
**BMI** & & & & & & \\ Volleyball group & 26.5 & 7.71 & 26.2 & 7.45 & \(-\)1.13 & 0.529 & \\ Combination group & 31.3 & 8.61 & 31.3 & 8.36 & 0 & 0.892 & \\ \hline
**FAT \%** & & & & & & \\ Volleyball group & 24.5 & 9.12 & 24.1 & 9.01 & \(-\)1.63 & 0.820 & \\ Combination group & 27.3 & 9.90 & 27.9 & 9.39 & 2.20 & 0.876 & \\ \hline
**Muscle Mass \%** & & & & & & \\ Volleyball group & 65.7 & 11.12 & 65.4 & 10.99 & \(-\)0.46 & 0.802 & \\ Combination group & 66.9 & 10.32 & 66.8 & 10.09 & \(-\)0.15 & 0.912 & \\ \hline
**Visceral Fat \%** & & & & & & \\ Volleyball group & 9.34 & 7.03 & 9.28 & 6.98 & \(-\)0.64 & 0.724 & \\ Combination group & 9.79 & 7.27 & 9.50 & 7.09 & \(-\)2.96 & 0.040 & d = 0.04 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Analysis of data for the selected anthropometric variables from Pre- to Post-test in Combination and Volleyball group. jump) than the VOL group (12.28% vs. 4.26%). No other significant changes were noticeable after the comparative analysis. The anthropometric abilities stayed significantly unchanged in both groups after the selected training program. The only exception was visceral fat in the COM group, where the subjects significantly decreased their percentage of fat.