Taekwondo was established as an official event for the Tokyo Paralympics in January 2015. Since then, the level of skill in the sport as a whole has increased rapidly, all throughout the world. The style of taekwondo selected for the Paralympics was gyeorugi (sparring), which is open mainly to athletes with upper limb impairment. Athletes are divided into four classes (K41-44) according to the location of amputation, etc., with three weight classes for both genders. Unlike in able-bodied taekwondo, attacks to the head are not permitted, and athletes compete with kicks alone.