## 2 Materials and Methods
### Characteristics of the Experimental Training Program  
All tasks aimed at enhancing motor coordination were included within a 15 to 30 min segment of the 90 min training session. One of the key priorities of this program was the variety of exercises used. A wide range of training equipment was employed, and the complexity of the exercises varied and increased throughout the experiment (progressive difficulty principle). Another significant feature was the timing of the stimulus during training. The coordination exercises were not directly preceded by intense anaerobic or mixed exercises. Coordination tasks were integrated into warm-ups, technical-tactical drills, and tactical activities. The number of training units in the macrocycle that included exercises aimed at developing broadly understood motor coordination ranged from 3 to 4 sessions. The exercises were designed and implemented with the intention of targeting all muscle groups of the participants, both analytically and holistically. Detailed contents of the coordination training exercises in the experimental program are presented below. \begin{table}
\begin{tabular}{c c} \hline \hline \multicolumn{2}{c}{**Adolescent Handball Players (n = 45)**} \\ \hline Included: n = 27 & Excluded: n = 18 \\ Inclusion Criteria & Exclusion Criteria \\ Age \textgreater{} 14 years & Current injuries or conditions that may affect \\  & participation in training or studies. \\ \textgreater{}100 min time play & Lack of consent from the athlete or their legal \\  & guardians for participation in the study. \\  & Athletes with no experience in league \\  & competitions. \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Inclusion and exclusion criteria for handball players. Figure 1: Flowchart of the research intervention. The coordination exercises used in the experimental program are as follows:  
1. Passes with Two Balls Half-high passes with dribbling, half-high to half-high passes, simultaneous two-ball passes + one-handed catch, tossing one ball + two-handed pass with two balls + one-ball catch, and half-high passes with two balls, all performed in place. 2. Defensive Actions Blocking, clinching, movement, and offensive fouls combined with passing balls of different sizes and weights (handball size 0-2, volleyball, basketball, and tennis ball). 3. Exercises with Tennis Balls Dropping and catching a tennis ball with one hand (1/2 balls), dropping and catching preceded by hand circling over the falling ball (\"spinner\"), and dropping in a straight line and catching \"crosswise\" with 2 balls. Tossing and catching 2 balls in different directions and tossing 1/2 balls + clapping 1/2/3 times in front/behind the back. 4. Passes and Crossovers Using two ball sizes (sizes 1 and 2), passes in place, walking, jogging, and running with direction changes, and \"crossover\" actions without or with exchanging balls between participants. 5. Pair Competition Hitting the opponent on the shoulder/knee/foot while simultaneously exchanging the ball in any manner and catching a \"reaction\" ball in pairs while moving with step-together-step in a circle. 6. Dribbling Using two to three balls of different sizes and weights (handball size 0-2, volleyball, basketball, and tennis ball). 7. Exercises Using Gym Benches Two-footed/one-footed jumps on the bench (\"jumping jack\" legs), \"scissors on the bench\" left/right leg, \"step up-step down\" left/right leg, tossing/dribbling a ball while moving across a bench/inverted bench, two-handed/one-handed passes while standing/walking on a bench/inverted bench, and jumping from one side of the bench to the other while simultaneously dribbling the ball. 8. Exercises Using Court Lines Sprinting preceded by jumps over the line (both feet, one foot, sideways, and forward), alternating leg jumps (left and right) \"scissors\", stepping one leg over the line (left and right) \"one-foot step\", \"one-foot step up-step down\", and \"side step up-step down\" (left and right). 9.