SUMMARY
Background: Taekwondo is the technique of unarmed combat for self defense that involves the skillful application of techniques that include punching; jumping kicks, blocks, dodges, parrying actions with hands and feet. The stance position has been pointed out as important factor that can potentially affect the kick performance, so the stance position can be seen as a constraint for the execution. Therefore, the purpose of the study was to compare kinematic variables in preferred and non-preferred front leg axe kick in taekwondo according to two stance position (0, 45). Methods: 10 elite taekwondo players participated in the study. Kinematic analysis was performed by using sports motion analysis system. Results : Significant differences in kinematic data were found in front leg axe kick during 0 and 45 stance positions at the beginning of the kick; these differences disappear at the end of the kick. In comparison of kick at 0 and 45 the kick performed at 45stance position reacts faster than the kick perform at 0 stance position. Conclusion: According to the result of this report, experienced athletes are able to adapt their execution thus getting similar output at the end of the kick, that is, when the kicking leg impacts the target. Therefore, the stance position is a factor that affects the execution technique of taekwondo athletes kick so the stance position must be seen as a constraint to which athletes must adapt.