The Obi-Ani is a move built on a particular exchange between Obi-Wan and Anakin Skywalker in Revenge of the Sith. You know the one we mean. This excercise teaches saber handling, endurance, situational and bodily awareness, and comfort in moves that are not precisey Tactically Sound, but Rule of Cool.
It is also a requirement for every level of Testing.
How-To Video coming Soon, here is some Obi-Ani In Action: