Capoeira is a Brazilian martial art and game with roots originating in Angola and the Congo, and combining elements of dance, acrobatics and music. Here is an image of a stamp depicting capoeiristas, designed by Ewaldo Gato, and issued by Brazil on August 6, 1972 as one of a set of five Brazilian folklore stamps, Scott No. 1236, plus an image of a painting entitled "Capoeira or the Dance of War" (1825) by German artist Johann Moritz Rugendas (1802-1858), and a YouTube link to a video of a Capoeira group performing in Salvador Bahia Brazil.
Here are images of the six stamps in a set depicting practitioners of muay Lao, a traditional Laotian unarmed martial art similar to muay Thai, printed by lithography, and issued by Laos on January 30, 1982, Scott Nos. 361-66.
Judo match, designed by French artist Huguette Sainson (1929-2011), engraved by CÚcile Guillame (1933-2004), and issued by Andorra (French Administration) on November 24, 1979 to publicize the World Judo Championships, held in Paris, Scott No. 274.
Martial arts: Kung Fu (women in red clothes) and Taekwondo (men in white clothes), printed by photogravure, and issued by (South) Korea on November 20, 2002 as a joint issue with China (PRC, Scott No. 3246), Scott Nos. 2109b. & a.