TAI CHI CONCEPTS AND EXPERIMENTS

The mysteries of the Chinese martial art tai chi are illuminated with the help of science in this primer.

Chuckrow—the author of Tai Chi Dynamics (2008), a physicist, and a tai chi instructor—addresses the seemingly contradictory teachings of the masters of this martial art, like the admonition to use “no strength” in practicing it, and interprets them in light of Western physics and biology. His main idea is the concept of “expansive strength,” a kind of “hydraulic pressure” in which “bodily tissues can actively expand under the action of bioelectrical stimulation.” Expansive strength, he contends, is better than ordinary strength through muscle contractions because it doesn’t create metabolic waste products or telegraph one’s intentions to attackers. He goes on to apply more physics—explained in plain English, with the math tucked away in the appendix—to tai chi problems, like the niceties of maintaining one’s balance in a pushing match. (“If an opponent A exerts a force F on me, according to Newton’s third law, I automatically exert the same force F on A in the opposite direction….In order to remain in balance, A must arrange things so that the total frictional force of the floor on his feet exerts a force that is opposite to the force I am exerting on him.”) Much of the intricate book explores tai chi’s preoccupation with an exhaustive, even eye-glazing analysis of rudimentary bodily acts, such as taking a step—“As the knee k starts to arc forward, the lower leg lags behind, swinging backward relative to the upper leg; (b) the knee stops, and the lower leg swings forward past (c) to (d); (d) the lower leg has freely swung forward into a position with the heel just touching the ground”—or sitting down. (“True T’ai-Chi practitioners lower themselves slowly and first contact the chair without any commitment. Then, they mindfully transfer weight until it is safe to commit it fully.”) Physiologists may scratch their heads at Chuckrow’s notion of expansive strength, but otherwise his explications of the fundamental laws of natural motion, complete with diagrams, are written in reasonably clear, if involved, prose. Tai chi students will gain from the author a deep theoretical grounding in the discipline’s basic approach to movement along with a wealth of useful exercises to help them practice it.

This informative introduction to tai chi combines extensive discussions of principles with hands-on techniques.