I just finished reading Small Circulation by Jwing-Ming Yang and I've been implementing the energy practices in it. It hasn't involved changing much that I hadn't already learned from Mantak Chia's work on the Microcosmic orbit. If anything, it's provided more of a concrete explanation of the energetic mechanics involved with internal energy work. What I find useful about his writing is just how much work he's done to translate documents and explain the processes described in those documents. The illustrations and instructions are straightforward and very helpful in learning how to work with the qi/chi of the body. Overall, I recommend reading this book as it will provide a thorough grounding in energy work techniques.
5 out of 5 Taoist sages