## 4 Discussion
Another objective for the development of this research would be the use of additional variables that could affect the analyzed results, such as allowing players to use other means of moving or determining other starting positions and distances covered by players who specialize in playing in different positions. Applying the division of movement into the dominant and non-dominant directions in the analysis could also become the basis for targeted training depending on the observed trends. To the best of our knowledge, the present paper is the first to use such a procedure to assess movement in a block in response to light signals using modern FITLIGHT TrainerTM measuring devices. Nevertheless, despite the strengths of our study, our research also has some limitations that should be indicated. When comparing the findings of the present study to those presented by other authors, it is worth noting the use of slide step in the procedure of movement. Although some studies have indicated that this technique should be used primarily for shorter distances [11; 39], it guaranteed that all athletes moved in the same way. Therefore, training experience was not an exclusion criterion for participation in the study. However, it can be assumed that for players who more often move using other techniques, imposing a different technique could affect the quality of the task performed. It also appears that the body height and the length of the upper and lower limbs can affect the number of steps needed during movement and the difference in time between take-off and positioning the block at the correct height. This means that shorter players may need more time to position the block properly. An important factor that was taken into account when preparing the study procedure was the proper planning of rests. The division of all tasks into three patterns consisting of four sequences allowed the players' susceptibility to fatigue resulting from motor activities and prolonged attention to be reduced. However, in the case of the rests between individual tasks in a single sequence, their full unification was impossible due to the limited capabilities of the FITLIGHT TrainerTM system. The rest time between tasks S1 and S2 or S3 varied depending on the task performance speed. However, it was demonstrated that the FITLIGHT TrainerTM system allows for the creation of conditions similar to those during a game. Furthermore, we are aware that to conduct deeper analyses of the effects of training complex perceptual-cognitive skills on the improvement of specific motor skills used in volleyball, it would be necessary to design more detailed measurements and longitudinal studies. In addition, our study focused only on young men practicing volleyball, so it would be worthwhile to include measurements of young women and adult women and men with different levels of sports experience in future studies. Given the nature of the present study, the small group size, and the above weaknesses, we emphasize that our results should be interpreted with caution, and we are far from any generalizations. Nevertheless, we believe that perceptual training designed to develop visual and perceptual-cognitive skills to achieve better training results in real-world competitions can help to improve athlete efficiency. Furthermore, the FITLIGHT TrainerTM system, despite its limitations, can be a useful tool to conduct research in this field.