Hi, just curious, I think this is a question on physiology. What does it take to be able to do the Cossack dance , in the first 8 seconds or so of: It seems impossible for me to even move when I am in that position, in my knees, let alone being able to jump around while stretching out my legs. If it is not too difficult, I would like to give it a shot and learn how to do it myself. Is it an issue of developing the right muscles , e.g., pelvis, thigh and below? Maybe flexibility of knee ligaments? Anything else? Thanks.