Master Wong, may I humbly recommend the "GoPro" camera to you? It has a really nice wide-angle lens that captures much more images in close-range settings, allowing the full-body movements demonstrated by you and your partners to be better seen on film, instead of just showing either the upper-body or lower-body part. In this video you posted, for example, it was difficult to see your leg movements until the person who held the camera later shifted it downwards.
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