Board Thread:Theories and Speculation/@comment-26138683-20150322132758

I know that generally speaking, chakra is the combination of physical and spiritual energies, but I never really understood what that meant practically. For example, is Yin-chakra spiritual and Yang physical? And if so, if someone says he has Yin or Yang nature, what does that mean? What does nature transformation and shape manipulation have to do with these properties? Basically, I'm confused as to the place of Yin and Yang in all of this, as well as what makes up a jutsu. 