This is called taichi qigong. It is a very good warmup for doing tai chi and also stands on its own as a relatively simple yet very effective qigong workout. I have done some research on this and trust me, this is one of the best workout videos to watch and practice with. The tempo is not too slow or too fast. The teacher I study with, Kwan Sai Hung does a few of the movements differently, but that is often the case with a traditional form, taking on individual variations as it gets passed down through the generations.
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