Question: Who practice Japanese martial arts?
Context: Japanese martial arts refer to the variety of martial arts native to the country of Japan.  At least three Japanese terms are used interchangeably with the English phrase "Japanese martial arts". Keikogi (稽古着 or 稽古衣 ) or dōgi (道着 ) is a uniform for training, used in martial arts derived from Japan, or budō.  ("Keiko" means practice, "gi" means dress or clothes.)  The prototype for the modern keikogi emerged in the late 19th century.  The keikogi was developed by judo founder Kanō Jigorō.  Japanese martial arts historian Dave Lowry speculates Kanō derived the uniform's design from the uniforms of Japanese firefighters' heavy hemp jackets called "hanten".  By 1920, the keikogi as it exists today was worn by Kanō's students for judo practice.  The Kodokan (judo headquarters) has a photo taken in 1920 that shows Kanō wearing a modern keikogi. Koryū (古流 , old style) is a Japanese term that is used to describe Japanese martial arts that predate the Meiji restoration (1868).  The term is synonymous with "Kobudo" (古武道, ancient martial arts) and contrasted with Gendai budō "modern martial arts" (or shinbudo "new martial arts") which refer to schools developed after the Meiji Restoration. Budo: The Art of Killing is an award winning 1978 Japanese martial arts documentary created and produced by Hisao Masuda and financed by The Arthur Davis Company.  Considered a cult classic, the film is a compilation of various Japanese martial art demonstrations by several famous Japanese instructors such as Gozo Shioda, Taizaburo Nakamura and Teruo Hayashi.  Martial arts featured in the film include: karate, aikido, kendo, sumo, and judo among others.  The only modern Japanese martial art not featured in the film is kyudo. Shurikenjutsu (手裏剣術 ) is a general term describing the traditional Japanese martial arts of throwing "shuriken", which are small, hand-held weapons used primarily by the Samurai in feudal Japan, such as metal spikes "bō shuriken", circular plates of metal known as "hira shuriken", and knives ("tantō"). Võ Bình Định (short for "võ thuật Bình Định", martial arts of Bình Định Province) is a regional form of martial arts in Vietnam.  All martial arts practiced in Tỉnh (State or Province) Binh Dinh is called Võ Bình Định.  There are 11 huyện (Counties or Districts) in the Binh Dinh Region that practices martial arts with villages and cities within each counties that contain style ranging anywhere from 100 to 600 years old.  Counties in the Bình Định Province include Phù Mỹ, Huyện Phù Cát, huyện Tây Sơn, huyện An Lão,huyện Hoài Nhơn, Hoài Ân, Huyện Vĩnh Thạnh , huyện Vân Canh, Quy Nhơn, Tuy Phước, and An Nhơn.  Three famous villages include Thuận Truyền, and An Vinh both which are located in the Tây Sơn district along with An Thái which is in the An Nhơn district.  Thuận Truyền Village and An Vinh Village style of Võ Bình Định is often considered as Võ Tây Sơn or also called Võ cổ truyền meaning Traditional Vietnamese Martial Arts and in the eastern district An Nhơn is An Thái style which is considered Võ Tàu or Chinese Martial Arts.  There is an old saying in the Binh Dinh Region which goes "Roi Thuận Truyền, Quyền An Vinh" which means the Thuận Truyền Quyền village is famous for Staff Techniques and An Vinh Village is famous for empty hand forms.  An Thái village is also famous empty hand forms along with its various Chinese Martial Arts that is influenced into Vietnamese martial arts.  Another saying in the Binh Dinh Province is "Trai An Thái, gái An Vinh" meaning that males practice An Thái style and females practice An Vinh style.  The reason for this saying is because the An Thái style utilizes more power in the empty hand forms making it more suitable when performed by a male.  Vietnamese people are typically smaller in stature and the An Vinh style assumes that the opponent is not Vietnamese making them possibly taller and stronger.  With a height and strength advantage An Vinh Style utilizes speed to overwhelm their opponents which can be seen in their empty hand forms and is more suited towards female fighters.  There are systems that are not located in the Tây Sơn district however they are consider Võ Tây Sơn as it contains components of the Tây Sơn style for example Võ Đường Chùa Long Phước in the Tuy Phước district teaches many forms that are seen in the Tây Sơn district such as Ngọc trản quyền, Song Phượng kiếm, Lão Hổ Thượng Sơn and Hùng kê quyền for example. Suburi (素振り ) is a Japanese word for practice swings used in sports such as baseball, tennis, golf, and in martial arts.  Outside Japan, the word is used exclusively for repetitive individual cutting exercises used in Japanese martial arts such as kendo, aikido, iaidō, and kenjutsu.  Often a shinai (for kendo), bokken, suburitō, or even tanren bō are used.  An iaitō or shinken can also be used, albeit rarely. Kenshiro Abbe (阿部 謙四郎 , Abe Kenshirō , 15 December 1915 – 1 December 1985) was a prominent Japanese master of judo, aikido, and kendo.  He introduced aikido to the United Kingdom in 1955, and founded the Kyushindo system.  Abbe was a graduate of the Budo Senmon Gakko, having studied judo and kendo there.  Following an illustrious early career in the martial arts, he served in the Imperial Japanese Army before and during World War II.  He then trained in aikido under its founder, Morihei Ueshiba, for a decade.  Abbe held "dan" ranks in several martial arts, most notably 8th "dan" in judo, 6th "dan" in aikido, and 6th "dan" in kendo.  After introducing aikido to the UK, he established several Japanese martial arts councils there during the late 1950s.  He returned to Japan in 1964 and remained there for most of the remainder of his life.  There are contradictory accounts of Abbe's final years, but it appears that he was in poor spirits and poor health towards the end. Samurai (侍 ) were the military nobility and officer caste of medieval and early-modern Japan. Kashima Shinden Jikishinkage-ryū (鹿島神傳直心影流 ) , often referred to simply as Jikishinkage-ryū or Kashima Shinden, is a traditional school ("koryū") of the Japanese martial art of swordsmanship ("kenjutsu").  The school was founded in the mid-16th century, based upon older styles of swordsmanship, and is one of the few ancient Japanese martial arts schools still existing today.
Answer: Samurai