Hello. I've trained for two years under my grandmaster and his students. Sometimes I go online to study new forms. I have noticed that I can't seem to find many videos in which the practitioner is NOT bouncing up and down after every movement in his form. Nobody I train with ever does this during forms. My boyfriend trains in Shotokan and no one in his school does this either. Is this a very common thing and is there logic behind it? What are you thoughts. Thanks!