Board Thread:Theories and Speculation/@comment-26138683-20150322132758/@comment-3279282-20150322160606

As you said, chakra is the result of combining your spiritual and your physical energies. Despite being usually made up of 50:50, chakra can also have a different ratio of both energies. Chakra that's made up of mostly spiritual energy is Yin chakra, while Yang chakra is made up of mostly physical energy.

It is unknown if you can add nature manipulation to these chakras, since they're usually used in their raw form, but form manipulation is definitely possible. As it is with Fire Release, for example, the release of Yin and Yang chakra is called Yin Release and Yang Release.

Or so the theory goes. However, Hagoromo and his Yin and Yang powers along with Yinyang Release complicated everything and the explanation in the fourth databook doesn't suffice, either.