These small circles are called Venus holes. They are formed on the lower back in men and women. In men, they are called Apollo holes. They are located in a place where two bones connect the pelvis, and can be seen only in people who have this genetic predisposition or appropriate size ligaments. It’s genetics.
We cannot choose whether we have them or not. They are a sign of good circulation and a healthy body. Great circulation is very important to achieve orgasm easily. Venus holes are located in a place where there’s no muscle, so it is impossible to create them with some exercises, but if you exercise to eliminate the excess of excess fat, these holes can become visible.