Here is an interesting old film of M. Saito demonstrating the 31 jo kata. Part of what makes this film most interesting to me is that he appears to be wearing zori or geta and that affects his taisabaki and kamae. Specifically, he is placing his feet more carefully and is using more upright, natural postures than are seen in most demonstrations of the 31 jo kata. The lesson to take from this is that you do not have to strike a wide-legged pose between every move (see the following film) for the exercise to be correct.
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Patrick Parker
www.mokurendojo.com