Various spiritual traditions offer a wide variety of devotional acts. There are morning and evening prayers, graces said over meals, and reverent physical gestures. Some Christians bow their heads and fold their hands. Some Native Americans regard dancing as a form of prayer.Some Sufis whirl. Hindus chant mantras. Orthodox Jews sway their bodies back and forth and Salah for Muslims ("kneel and prostrate as seen on the right"). Quakers keep silent. Some pray according to standardized rituals and liturgies, while others prefer extemporaneous prayers. Still others combine the two.