The purpose of this study was to investigate the differences in the agonist muscle activity during competition Dollyochagi and badachagi by recording the EMG aactivity of different phases. 1. There was no statistical difference in the average EMG value for the abdominal muscles during all phases. 2. There was no statistical difference in the average EMG value for the erector spinae during all phases. 3. There was no statistical difference at P1 but there was no statistical difference during P2 and P3 for average EMG for the biceps femoris. 4. There was no statistical difference in the average EMG value of the anterior tibialis during all phases. 5. There was no statistical difference in the average EMG value of the gastrocnemius during all phases. To summarize from the above results, there was a similar muscle pattern during the competition dollyochagi and the badachagi and for a powerful and accurate impact during the dollyochagi, as the foot leaves the floor there is a low level of muscle activity, and until the maximum knee flexion, the abdomium and quadriceps muscles coordination are important. At impact, for balance the errector spinae supports the back and is needed to maintain the posture of flexion for the upper body.