These small circles are called “Venus Holes” and are formed on the lower back of women. However, some men can also have them and in that case they are called “Apollo Holes”
They are located in a place where two bones connect the pelvis, and can be found only in people who have this genetic predisposition.
The “Venus Holes” are a sign of good circulation and a healthy body.
Since “Venus Holes” are located in a place where there is no muscle, it’s impossible to create them with exercises. However, eliminating some fat can make them a little more visible.
The important thing is not to have them for the looks but to be proud of your genetic predisposition for good circulation and health.
Science Source: http://healthybiofood.com;
Image Source: http://www.spinalmedical.co.uk/back_pain_causes.php