Reasons for calf augmentation are varfied and include cosmetic enhancement and reconstructive necessity. Men and women body builders often use calf augmentation to enhance the fullness, shape and bulk of the calf muscles when exercise falls short on further development. Others choose calf implants to improve proportions, definitions and curves of the lower legs for simple muscular enhancement or to correct the appearance of thin and/or bowed legs. Calf implants can also be used to correct asymmetry in calf muscles from trauma or genetic birth deformities such as in polio, spina bifida and clubfoot.