You have probably noticed that some people have two small holes on their lower back. They are called Venus holes in women, and Apollo holes in men.
The exact location of these holes is the place where 2 bones form the pelvis. They can be seen as a result of genetic predisposition or ligaments in appropriate size. So, since genetics is responsible for them we can’t choose to have them or not.
These holes on the back mean you have a healthy body and good circulation, which is necessary for easily achievable culmination in intercourse.
There’s no muscle in the place where these holes are located, so they can’t be formed with exercising. On the other hand, they can become visible if you get rid of the excess fat.