תהילים צה:ו פירוש: רש״י וMetzudat David

let us kneel Heb. נברכה, an expression of (Gen. 24:11): “He made the camels kneel (ויברך).”

Nishtachaveh- this is lying the entire body on the ground

v'Nichr'ah- this is the bending of the head and part of the body. Nivrechah- this is the bending of the knees down to the earth.