## 4 Discussion  
Studying postural stability in sports can provide insight into the development of specific postural strategies [16]. Physical effort, that is, the total kinetic energy required to engage in an activity and to change the position of one part of the body relative to another, is one of the factors that strongly affects the stability of the body [12]. The type of physical activity, as well as the level of performance, can modulate dynamic and static postural control. Long-distance running is a huge effort for the body. Among other things, it puts considerable strain on the musculoskeletal system, especially the feet, which are subject to considerable pressure due to their distal position and direct contact with the ground. Prolonged exertion can cause fatigue of the soft tissues stabilizing the sole vault of the foot, which in turn can affect the distribution of body weight across the different zones within the foot [27; 28]. According to [PERSON] et al. [29], during prolonged running such as \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & & \multicolumn{6}{c}{**r-Pearson**} \\  & & \multicolumn{6}{c}{**Variable: Length of Sway Path COP**} \\  & & \multicolumn{6}{c}{**\(\alpha\) = 0.05**} \\ \hline Lateralization & GROUP & M & SD & r & R2 & t & \(p\) & N \\ \hline Dominant & C & 203.92 & 11.49 & & & & & \\ limb & C & 191.69 & 18.18 & & & & & \\ \hline Dominant & PL & 201.09 & 13.64 & & & & & \\ limb & PL & 189.99 & 20.89 & & & & & \\ \hline Dominant & M & 215.18 & 31.34 & & & & & \\ limb & M & 184.87 & 34.62 & & & & & \\ \hline \hline \end{tabular}
\begin{tabular}{c c c c c c c c} \hline \hline \multicolumn{1}{c}{\(p\) < 0.001, C—Control group, PL—Powerlifters group, M—Marathon runners group.} \\ \end{tabular}
\end{table} 
Table 6: The r-Pearson correlation coefficients of the variable COP sway path length between dominant (D) and non-dominant (ND) limbs in the three study groups. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{3}{*}{
\begin{tabular}{c} **No.** \\ **Group** \\ \end{tabular} } & \multicolumn{6}{c}{**Post-Hoc Bonferroni Test; \(p\)-Value**} \\  & & \multicolumn{6}{c}{**Variable: SP COP (Sway Path)**} \\ \cline{2-9}  & & & **(1)** & **(2)** & **(3)** & **(4)** & **(5)** & **(6)** \\  & **GROUP** & **Lateralization** & **M1** & **M2** & **M3** & **M4** & **M5** & **M6** \\  & & & **203.92** & **191.69** & **201.10** & **190.00** & **215.18** & **184.87** \\ \hline \multirow{2}{*}{1} & C & Dominant & & & & & & \\ limb & & & & & & & & \\ \hline
2 & C & Non-dominant limb & 0.1803 & & & & & \\ \hline
3 & PL & Dominant & 1.0000 & 1.0000 & & & & \\ limb & & & & & & & \\ \hline
4 & PL & Non-dominant limb & 0.5193 & 1.0000 & 0.6031 & & & \\ \hline
5 & M & Dominant & 1.0000 & 0.0027 & 0.4714 & 0.0023 & & \\ limb & & & & & & & \\ \hline
6 & M & Non-dominant limb & 0.0328 & 1.0000 & 0.2014 & 1.0000 & 0.0000 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Post-hoc Bonferroni test for a two-way analysis of variance, using the following variables: Sway Path COP, 1 Factor GROUP, and 2 Factor Lateralization. a marathon, the pressure and load on the feet are distributed differently than during daily activities. Hence, this type of physical activity can have a significant impact on the foot load center (COP). During long-distance running, the foot experiences repeated impacts and pressures, which can lead to a shift in the point of the greatest load, which is a natural response to prolonged exertion. Typically, the pressure shifts more to the forefoot and the toes, as well as to the lateral parts, depending on the running technique and the type of surface being run on. This prolonged load in certain areas can affect changes in the structure of the muscles and the bones of the feet. These changes may lead to painful coms, which can cause discomfort and pain, and may even lead to injury [29]. In another aspect, practicing powerlifting can affect the COP.