Can you become a professional athlete by watching videos on YouTube?
It is difficult, but still possible. There is only one case in history where an athlete didn’t have a coach and still became a professional, and even won the world championship and got a silver medal in the Olympic games. The name of this hero is Julius Yego. During the first several years, he learned to throw a spear just by watching YouTube videos. And it was only once he won the African games, that he started to look for a mentor.