Muay Thai also called Thai boxing is a combat sport originating from Thailand. It features stand-up striking interspersed with different clinching techniques. The Muay Thai discipline is focused on the physical and mental aspect and includes combat on shins known as “the art of eight limbs”, which is characterized by the use of elbows, shins, knees and fists in combinations, associated with a thorough physical preparation making a full contact fighter with these skills very effective in their kind of combat sport.
Muay Thai became globally known and famous in the 20th century when Muay Thai practitioners defeated well-known practitioners of other martial arts disciplines.
The Professional Boxing Association of Thailand (P.A.T) is the authority which governs Muay Thai as a sport in Thailand as sanctioned by The Sport Authority of Thailand (S.A.T.).
Overseas the World Muaythai Federation (WMF) is the governing body.
Muay Thai has similarities with other disciplines influenced by Indian cultural sphere, namely Tomoi from Malaysia, Lethwei from Myanmar, Muay Lao from Laos, and Pradal Serey from Cambodia.
Here is a video of a fitness regimen to build up bodyweight strength while training for Muay Thai actually used by a Muay Thai practitioner.