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Although the master knows about the topic the dvd was mainly him talking and writing on a white board.. had a few mins at end where he sat and did some breathing... Not what I was looking for. I really didn't want to know about sperms, etc.. as learnt about it in Biology classes.>!! For me this was not a good purchase - have returned it... I am sure the gent ibn the video is a very good teacher in this topic.