**5. Conclusions**

In the present study, we analyzed the rationality of the 110 m hurdle clearance technique of Colin Jackson and Dayron Robles, using diagnostic technology for kinematic analysis. Both athletes have roughly the same personal record in the 110 m hurdle races (Jackson 12.91 s, Robles 12.87 s). The two hurdlers are quite different in morphological constitution, with Dayron Robles being 10 cm taller than Colin Jackson. Based on the results obtained, it can be concluded that Dayron Robles has a more effective hurdle clearance technique. It is characterized by a smaller loss of horizontal velocity of COM during clearance, a better COM flight parabola over the hurdle, and a smaller difference between the hurdle height and the height of the highest COM point, compared to Jackson's achievement. It proves that their hurdle clearance efficiencies differ but depend on the same kinematic parameters. Therefore, it can be considered that their individual technique of overcoming the hurdle their reached individual highest efficiency at this time. On this basis, we can also assume that the difference in overcoming one hurdle (the fifth) accumulated in the remaining hurdles until the end of the race, which reflects the final results of the races. Here Robles obtained a better running time in the 110 m hurdles.

#### **6. Practical Application**

From a practical point of view, based on some of the spatiotemporal parameters presented in the present analysis, there are some high hurdle common performance indicators. In order to optimize high hurdle performance with special regard to clearance hurdle movement performance, lower vertical displacement of COM, combined with right angle of take-off and short contact-time at the take-off and landing phases must be considered. These elements help improve a quick turn between horizontal and vertical velocity of forward propulsion and fast return of the trail leg at landing. To improve these indicators, appropriate training needs to be applied. It should consider high technical proficiency training and first of all activities which improve a higher rate of force development.

**Author Contributions:** Conceptualization, M.C. and K.M.; Data curation, S.Š. and K.M.; Formal analysis, M. ˇ C., ˇ N.B., S.Š. and K.M.; Investigation, M.C., N.B. and S.Š.; Methodology, M. ˇ C., N.B., S.Š. and K.M.; Resources, M. ˇ C.; ˇ Software, N.B. and S.Š.; Supervision, M.C. and K.M.; Validation, M. ˇ C. and N.B.; Writing–original draft, M. ˇ C., N.B. ˇ and K.M.; Writing–review & editing, M.C. and K.M. All authors have read and agreed to the published version of ˇ the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** The authors would like to acknowledge the involvement of the participants for their contribution to this study.

**Conflicts of Interest:** The authors have no conflict of interest to declare. The results do not constitute an endorsement of any product or device. The authors would like to thank the sprinters who participated in this study.
