Pradal Serey or Kun Khmer is an unarmed martial art fromCambodia. In Khmer the word pradal means fighting or boxing and serey means free. Kun Khmer is considered one of Cambodia's national sports. Kun Khmer is a kickboxing form descended directly from early forms of khmer fighting techniques that went by the name Yuthakun Khom. Its moves have been slightly altered to comply with the modern rules.