## 4 Discussion  
The findings of our study showed significant changes in balance performance indicated in static balance performance, and dynamic balance performance as well, after the intervention without any sex differences of monitored subjects of the age 65+. This may indicate the universality of the applied physical intervention with respect to both sexes. Furthermore, the results indicated high effectiveness of the applied physical intervention in terms of the possibility of static and dynamic balance performance optimization, in a relatively short period, although some authors [36] emphasize that in old age, the loss of muscle mass and thus muscle strength in females can reach a critical level earlier than in males, which can subsequently be reflected in the deterioration of postural balance and gait in females. The findings of the intervention effects on static balance performance can be summarized as follows: (1) In both sexes of the experimental group, all measurements of static balance performance were significantly improved after the applied physical intervention; (2) In accordance with our assumptions, it was found that already short-term physical intervention led to a significant increase in static balance of performance in seniors, males and females, of the experimental group in comparison with the control group. Our results correspond to those from previous studies examining the impact of physical interventions on static balance measurements in seniors. For example, according to the studies [37,38], the authors stated that static postural balance training for both males and females 65+ years of age must be developed in a controlled manner, under the supervision of a coach and assistants, to achieve significant progress in the static balance performance. They also mentioned that the question of whether performance development in static balance differs significantly between females and males has not been convincingly answered according to the fact that due to the performed physical intervention the static balance improved in both sexes, but the improvement was more pronounced in females compared to males. The aim of our study was not to primarily examine the relationship between the effectiveness of intervention with control and supervision; however, we believe that interpreted positive effects of supervised balance performance training are particularly pronounced and obvious. In accordance with that and on the basis of the realized physical intervention in our study, we may recommend the inclusion of supervised lessons in balance training programs in both sexes of seniors 65+ years of age in order to effectively improve balance and muscle strength, which is in line with the recommendations of experts who have dealt with this issue more deeply [39]. Of course, the biomechanical organic aspect of the analyzed result plays a significant role in male and female balance performance. The results are also in line with the authors [40] stating that differences between females and males in terms of dynamic balance performance increase with age to the detriment of women. Other authors [41,42] examined the effect of physical intervention training on static balance traits in seniors 65+ years of age living in senior homes compared with seniors living in their own residences. In comparison, the training group in the senior homes showed a better improvement in their static balance performance (i.e., less postural swing