The positive and negative circles are two foundational exercises that practice a full revolution of the body. They are circles in the sense that they loop; however the path that the hand takes when performing the exercise is intentionally egg-shaped. The rear curvature is thick, and the front is thin.
While the exercises are fixed routines, they can also be generalized to the two directions of Revolution of the body (正旋 zhèng xuán
and 反旋 fǎn xuàn
). In this sense, every movement in Taijiquan can be considered to be part of a positive or negative circle.