The purpose of this study was to provide mechanical information about healthy adult walking mechanical efficiency from the perspective of a dynamic approach. The focus was  to analayze step-to-step transition (STST) mechanical cost of transport (MCOT) at high intensity walking gait. A twenty-five healthy adult males participated in the study from Sport Science and Physical Education department at Hashemite University in Jordan. Ariel performance analysis system (APAS) to find the preferred transition speed (PTS), and the BTS SMART-DX were used to gather data for and for Analysis System to explore kinematical characteristics. The results showed stance phase duration of 0.479 ± 0.03 s for trailing leg (T.leg) and 0.447 ± 0.02 s for leading leg (L.leg), where the double stance phase (DSt) is 0.110 ± 0.03 s for T.leg and 0.100 ± 0.03 s for the L.leg with STST-MCOT 9.6 ± 0.06 J and mechanical efficiency percentage of 9.6 %.   It is highly recommended to consider locomotor mechanical efficiency assessment as essential of life style and to maintain stride-to-stride fluctuations, which may correlate to loss of stability. In addition, to further study the effect of race walkers and its related effects of STST adaptation