Three useful new books give tai chi practitioners interesting perspectives on practice from a very practical angle, with much attention to body mechanics.
The New Rules of Posture: How to Sit, Stand, and Move, by Mary Bond (Healing Arts Press, 2007). The author, a movement therapist with a background in dance and Rolf, presents a very accessible approach to understanding and correcting one's posture. This book will appeal to anyone who experiences postural problems or pain, or for practitioners. It will be helpful to tai chi teachers in analyzing structural problems that students commonly face.
A Tai Chi Imagery Workbook: Spirit, Intent, and Motion, by Martin Mellish (Singing Dragon, 2011). This compendium supplies tai chi enthusiasts with a wealth of ideas and images to use in practice. Good for self-study as well as for teachers, this book is a welcome and innovative addition to everyone's tai chi library. Mellish, who has a background in mathematics, uses such things as fractals--in easy to understand terms--to describe concepts of movement. The wide-ranging and always interesting material is presented in text, drawings, and photographs.
Robert Chuckrow's Tai Chi Dynamics: Principles of Natural Movement, Health, & Self-development (YMAA, 2008) approaches tai chi in a similarly analytical manner as Mellish's book, however Chuckrow's is from a more intellectual view. In addition to details of body mechanics, he has included insights and techniques gained from his studies with Cheng Man-ch'ing (Zheng Manqing)