무릎 유튜브
프레임이란??https://www.youtube.com/watch?v=Dcktqlu3YOI&list=PLSdV9gZwsTPTM-Tz8ZjzkMrhg7N7MdA50
낙법 시스템https://www.youtube.com/watch?v=G_Jsh1KJ2K0&index=2&list=PLSdV9gZwsTPTM-Tz8ZjzkMrhg7N7MdA50
여러가지 시스템과 조작법,용어 https://www.youtube.com/watch?v=aoGzxkokiL4&list=PLSdV9gZwsTPTM-Tz8ZjzkMrhg7N7MdA50&index=3