Toning exercises are physical exercises that are used with the aim of developing a physique with a large emphasis on musculature. In this context, the term toned implies leanness in the body (low levels of body fat), noticeable muscle definition and shape, but not significant muscle size ("bulk"). Research and basic anatomical knowledge implies that the notion of specific exercises to improve tone is unfounded. Exercises can aid fat loss or stimulate muscle hypertrophy, but cannot otherwise improve tone. The size of the muscle can change, as can the amount of fat covering the muscle, but the 'shape' cannot. Appearing "toned" is a common fitness goal, particularly associated with women.