When using a single camera view you are limited to the analysis of 2D movements, and its very important that the camera is placed perpendicular with respect to the movement.
If the skill that has to be analyzed has movement in more than two directions (not just 2D X,Y but 3D X,Y,Z) its important to use multiple cameras. Its important that the movement is captured from multiple angles of the single movement trial and not from multiple trials of the movement. Some golf systems use this method and it absolutely wrong to do.
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