
Given the following passage

"Professional wrestling (colloquially abbreviated to pro wrestling or wrestling) is an athletic form of entertainment based on a portrayal of a combat sport. Taking the form of live events held by touring promotions, it portrays a unique style of combat based on a combination of adopted styles, which include classical wrestling, catch wrestling and various forms of martial arts, as well as an innovative style based on grappling (holds/throws), striking, and aerialism. Various forms of weaponry are sometimes used.",

answer the following question. Note that the answer is present within the text.

Question: What non wrestling discipline is often incorporated into the sport of wrestling? 

martial arts
