I'm not sure that when it was exactly in the movie file. But it is almost same time of this movie file.

The interesting point of this movie file is that it shows many girls(very common Korean girls) are training Taekwondo at gyms, kicking all the way(though in short film). It means that that style of training of Taekwondo was prevailed all over Korean at that time. And it again means that kicking was most important part of Taekwondo training before that time.

Accordingly, It means, the current unique Taekwondo training style, which focuses on kicking in most part, was not the matter of mere today. It can be concluded ressonably that it begain at the beginning of modern Korean history from 1945 on.