The Nei Gong for Martial Power Audio Book, read by the author. Downloadable MP3.

The first installment in the Nei Jia Theory and Practice Series.
 
This audio book teaches the deepest aspects of Xingyiquan inner cultivation, details for whole body connected power and fighting strategy from the Four Classics of Inner Power.
 
Revealing the inner door training principles and strategies to develop internal power and fighting skill.