The kecak dance is typically performed by about fifty to one hundred men wearing only loincloths; their upper bodies are left bare. They form concentric circles, in the middle of which is a traditional Balinese coconut oil lamp. First they move their bodies rhythmically to the left and to the right, chanting the words "chak ke-chak ke-chak ke-chak" continuously in coordinated harmony and beat, in slow rhythm. Gradually the rhythm speeds up and by turns they lift their hands, trembling, into the air.