jīng is therefore considered quite important for longevity in traditional chinese medicine (tcm); many disciplines related to qìgōng are devoted to the replenishment of "lost" jīng by restoration of the post-natal jīng. in particular, the internal martial arts (esp. t'ai chi ch'uan) and the circle walking of baguazhang may be used to preserve pre-natal jīng and build post-natal jīng, if performed correctly. ginseng, particularly korean and chinese, is said to bolster the jīng.