This is not a circle exercise and yet it is an important QiGong circle series exercise. It revitalizes the energy in the pelvis.
Standing with your feet a shoulder’s width apart–thrust your hips forward and backwards 10 times or more.
As I checked this exercise out there are many other complicated versions that are currently popular for building gluts and a trim bottom. https://www.stylecraze.com/articles/effective-hip-thrust-exercises-and-their-benefits/#gref