Neigong, also spelled nei kung, neigung, or nae gong, refers to any of a set of Chinese breathing, meditation and spiritual practice disciplines associated with Daoism and especially the Chinese martial arts. Neigong practice is normally associated with the so-called "soft style", "internal" or neijia 內家 Chinese martial arts, as opposed to the category known as waigong 外功 or "external skill" which is historically associated with shaolinquan or the so-called "hard style", "external" or wàijiā 外家 Chinese martial arts. Both have many different schools, disciplines and practices and historically there has been mutual influence between the two and distinguishing precisely between them differs from school to school.
There is both martial and non-martial neigong. Well known examples of martial neigong are the various breathing and focus trainings taught in some traditional Taijiquan, Baguazhang and Xingyiquan schools. An example of non-martial neigong is the discipline known as Daoyin.
You know that guy
who stole your girlfriend
away from you
in the summer of '95
he's going to die
you know her name
sits in your brain
like a tumor
eyes still shine in your memory
she's going to die
well you can carry that grudge
or you can let it go
but as sure as I'm singing this song, you know
she's going to die, she's going to die
five'll get you ten so just let it go
that she and he and i will hear the final chord