The ordinal power of the body, mijjit ("stomach") is the essence of the body itself, the facet of the Name that defines the body. Mijjit is present in most bodies in some degree, just as almost everything has a Name, but it is especially present in giants, who are the greatest masters of using it. Other beings have learned how to tap into it in their own bodies, and some rare esotericists have learned how to control it in others or from other bodies.
Nimusti, the giantish art of diet and exercise that alters the body. It has many other names, depending on the nation/species using it, but it is always some variation on nimusti. Some rare non-giants have learned how to use it as well, but they must do much more eating and exercising than giants to trigger it.
Ars Corpus, alchemically controlling mijjit; this is rare and usually reserved for work on cadavers
Sarira, the black nommic art of controlling the body of another through corrupted mijjit