周天运法，还精补脑：周天者，是每次气生，引气入任督行一周而归丹田，故谓

周天运法，还精补脑：<br>周天者，是每次气生，引气入任督行一周而归丹田，故谓之周天。此后静极气又生矣，外物立举。这时须不惊不动，待气足欲回时，以神领之，一吸而神气直上干顶，一呼而神气下降丹田，为之一周。以神守之，寂而照，照而寂，在杳冥之间把知觉泯去而入定矣。此后复生如此，谓之还精补脑。

周天运法，还精补脑：<br>周天者，是每次气生，引气入任督行一周而归丹田，故谓之周天。 此后静极气又生矣，外物立举。 这时须不惊不动，待气足欲回时，以神领之，一吸而神气直上干顶，一呼而神气下降丹田，为之一周。 以神守之，寂而照，照而寂，在杳冥之间把知觉泯去而入定矣。 此后复生如此，谓之还精补脑。

The method of Zhoutian Yun also refined and replenished the brain:<br>Zhou Tian, is each time gas, gas into the governor for a week and returned to dandian, so it is called the Zhou Tian. After that, the static Qi was born again, and the external objects were raised. At this time, it must not be shocked. When the Qi and feet want to return, it is one week to take the spirit and suck it straight up to the dry top, and the spirit will drop into the red field. With God, silent and light, according to silence, between the dead to the dead to the dead and into the fixed. Since then, it is called "essence and brain toning".<br>