This is only a brief thing that I read...But I am sure Master Clay can provide IN DEPTH INFO, since he has been training in it a long time.
Iron Shirt Chi Kung, an ancient Kung Fu practice designed to strengthen the
internal organs, root the being, and unify physical, mental, and spiritual
health, is introduced as a component of the Healing Tao system.
Preparatory techniques of breathing and relaxation and microcosmic orbit
meditation are covered. Postural practice and forms, breath alignment,
fascial anatomy, and muscle-tendon meridians are presented, along with
guidelines for developing a daily practice routine.
In Iron Shirt Chi Kung, a more dynamic practice involving a series of
several stationary postures. Firstly, the postures themselves are exacting
and serve to teach the student about the body's internal structure so that
one can always enjoy a (rooted) mechanical advantage to augment whatever
muscular force is already available. Secondly, the Iron Shirt breathing
techniques serve to cultivate a reservoir of Chi in the Dantien (Danjun) and
to reinforce the Wei Chi function (Wei Chi being the body's first line of
defense against illness and injury). Iron Shirt is recommended for all martial
arts students as the language and principles of body structure are more or
less universal.