A kick is a physical strike using the leg, in unison usually with an area of the knee or lower using the foot, heel, tibia, ball of the foot, blade of the foot, toes or knee (the latter is also known as a knee strike). This type of attack is used frequently by hooved animals as well as humans in the context of stand-up fighting. Kicks play a significant role in many forms of martial arts, such as savate, taekwondo, MMA, sikaran, karate, Pankration, Kung Fu, Vovinam, kickboxing, Muay Thai, Yaw-Yan, capoeira, silat, and kalaripayattu. Kicking is also prominent from its use in many sports, especially those called football. The best known of these sports is association football, also known as soccer.