"Pigu" originated from "not eating grains" in Taoist health preservation, and it was a common way of health preservation in ancient times. In martial arts, on the way to cultivate immortals, it should mean to cultivate immortals' bones and no longer need to eat.

Begging for Valley is a stage, which should mean reaching the level of begging for Valley in martial arts cultivation. Closed-door cultivation is a process. The purpose is different. If the purpose is to reach the stage of "crossing the valley", then it is ok to say that the practice is closed for "crossing the valley". But we can't generalize. Some are for the promotion of class, and some are for the reform.