In the daily and Sabbath services, when the line (numbered, above, as line 9, here translated literally) "But we bend our knees and bow" is recited, many have the custom to flex their knees and then bend from the waist, straightening up by the time the words "before ("lif'nei") the King of kings of kings" are reached. But on the High Holy Days of Rosh Hashana and Yom Kippur, the worshipper will not merely flex and bend, but will actually get down on his knees at those words, and many congregants will prostrate themselves on the floor (in those synagogues with sufficient floor space).