Move to Ruku (bowing down) position after saying "Allahu Akbar"
When you in Ruku position,say at least one time"Subhanna rabbeeyal adheem" (How perfect is my Lord, the Magnificent).
You can say it 1, 2, 3, or more.
Return to standing while saying "Sameea Allahu leeman hameeda" (Allah hears those who praise him).
When you are in a standing position lower your hands to your side and say "Rabbana walaka
al- hamd" (Our Lord, to You is all praise)
Prophet Muhammad (PBUH) Prayer
According to Authentic Ahadith