In Muay Thai practise, the initial Wai Kru is called - Kheun Kru (the initial Ceremony of Paying Respect to the Teacher). Subsequently, they will pay respect to their Teachers Ceremonially each year, which is called 'Yohk Kru'. But when ever the pupils intend to use the knowledge taught to them, they will always start by Paying Respect to their Teacher; this action is called Wai Kru or Bucha Kru (to Pay Respect to a Teacher