Before one begins to dance, the ritual-like 'Namaskaraya' movement is an obeisance done in the beginning and end of dance practice or performances by by the dancers. It is practiced as a sign of respect to Lord Buddha, God, parents and teachers in that order whilst a short chanting is said by the dancer. 

As the dancers touch the earth they'd dance on, followed by their hands coming together first at the top of the head, forehead then chest, they chant the following out loud: 

After the fourth and final chant, dancers would typically go up to their teachers and touch his/her feet for blessings, completing the Namaskaraya and begin to dance.

Activity (Optional)
Watch the following video demonstrating Kandyan Namaskaraya: 
https://www.youtube.com/watch?v=a6nT2rJ8MGw