These holes are located on the junction between the two bones of the pelvis and are seen in people who have the genetic predisposition or the proper size ligaments. As it depends on genetics, we cannot choose to have them or discard. They are signs of proper circulation and the healthy body. The right circulation is a vital prerequisite to attain orgasm very easily.
As Venus holes are placed at the site having no muscle, it is not possible to influence the show of the holes with exercising, but if you work to get rid of excess body fat, these holes can be made visible.