Karl Gotch in the context of "Billy Riley"

Shoot wrestling is a Japanese hybrid grappling style and combat sport. Shoot wrestling incorporates techniques from various wrestling, submission grappling, kickboxing and karate styles. It was particularly inspired and influenced by catch wrestling, a form of wrestling with submissions that was the predominant style of professional wrestling in the 19th and early 20th century, at the time a legitimate competitive sport and not yet predetermined.

Shoot wrestling originated in Japan's professional wrestling circuit (puroresu) of the 1970s, particularly stemming from the influence of wrestlers Karl Gotch, Lou Thesz and Billy Robinson, all who had an enduring popularity in Japan due to their serious submission wrestling style. Professional wrestlers of that era attempted to use more realistic or even "full contact" moves in their matches to increase their excitement, diminishing or eschewing the theatrical elements and acrobatics, looking more similar to an actual, unscripted fight. The name "shoot wrestling" comes from the professional wrestling term "shoot", which refers to any unscripted occurrence within a scripted wrestling event.

Aloysius Martin Thesz (April 24, 1916 – April 28, 2002), known by the ring name Lou Thesz, was an American professional wrestler and wrestling coach. Considered to be one of the last true shooters (legitimate wrestlers) in professional wrestling and described as the "quintessential athlete" and a "polished warrior who could break a man in two if pushed the wrong way", Thesz is widely regarded as one of the greatest wrestlers and wrestling world champions in history, and possibly the last globally accepted world champion.

Thesz won various version of the World Heavyweight Championship seven times, including three reigns as NWA World Heavyweight Champion, which he held for a combined total of ten years, three months and nine days (3,749 days) – longer than anyone else in history. In Japan, Thesz was known as the "God of Wrestling'" (like his Belgian counterpart, Karl Gotch) and was called "Tetsujin", which means "Ironman", in respect for his speed, conditioning and expertise in catch wrestling. Alongside Karl Gotch and Billy Robinson, Thesz later helped train young Japanese wrestlers and mixed martial artists in catch wrestling. In his final years, he was head coach at the CACC Snake Pit Japan (ja).