Gary Clyman's Chi Kung DVD
Gary Clyman is the biggest egoist I've ever had the misfortune to cross paths with. He MAY be a good martial artist... I don't know for sure as I've never actually met him but after exchanging emails with him I can say for sure that he is a total jerk !
One word of advise regarding his Tidal Wave Chi Kung DVD... Don't buy it.
I purchased the DVD and found it to be lacking any real depth. Also, It's grossly over-priced and he don’t give refunds.
In my humble opinion you'll do better studying Mantac Chia's Chi Kung books. They give clear and detailed instructions and are reasonably priced.