Muay Thai , sometimes referred to as Thai boxing, is a combat sport that uses stand-up striking, sweeps, and various clinching techniques. This discipline is known as the "Art of eight limbs", as it is characterised by the combined use of fists, elbows, knees and shins. Muay Thai became widespread internationally in the late 20th to 21st century, when Westernised practitioners from Thailand began competing in kickboxing and mixed-rules matches as well as matches under Muay Thai rules around the world. The professional league is governed by The Professional Boxing Association of Thailand , sanctioned by The Sports Authority of Thailand .