Back rolls, also known as back fat or bra bulge, refer to the excess fat that accumulates on the back, typically around the upper and lower back areas. These rolls often become more prominent when wearing tight-fitting clothing or bras. While back rolls are commonly associated with females, males can also experience them due to various factors such as genetics, poor posture, lack of exercise, and unhealthy eating habits.

Back rolls occur when there is an excess of subcutaneous fat, which is the fat stored under the skin. This excess fat can be influenced by factors like hormonal imbalances, age, and overall body composition. Additionally, muscle weakness or imbalance in the back muscles can contribute to the appearance of back rolls. While back rolls are a normal part of the body's fat distribution for many individuals, maintaining a healthy lifestyle with regular exercise and a balanced diet can help reduce their appearance and improve overall body composition.