This Chi Kung Sky Mountain Chi Kung Internal and External Chi Kung Sky Mountain Chi Kung is an internal Chi Kung or a Nei Kung. Not too many decades ago the term Chi Kung was rarely used, the more common term was Nei Kung. Nei means inner, so Nei Kung is a more internal of the internal arts. The different types of Chi kung for health along with Tai Chi and the other internal martial arts are all different types of internal work, it's just that some are more internal than others.
Some types are softer and some are more ridgid.
For the sake of this article I will call Internal Chi Kung Nei Kung, and the more common external chi kung will be called just Chi Kung. Chi kung practices are all derived from their parent Nei Kung systems. Nei Kung moves from the inside out, Chi Kung moves from the outside in. The emphasis in Nei Kung is on developing the core energy that travels through the center of the body and from there opening and energizing the peripheral energy lines. Chi Kung concentrates on working the more superficial energy lines first and through these affecting the core energy.