21st movement in HWA-RANG Tul. (Niunja So Ap Joomuk Kaunde Baro Jirugi.) 

This video shows two ways to perform the 21st movement in HWA-RANG Tul.
(21. EXECUTE A MIDDLE PUNCH TO C WITH THE RIGHT FIST WHILE FORMING A RIGHT L-STANCE TOWARD C, PULLING THE LEFT FOOT.).
According to the encyclopedia of taekwon-do and from the point of view of biomechanics, the second method is correct.

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