Assalaamu alaykum. I read the following on https://islamqa.info/en/82627 concerning the Takbeeraat of movement: "So he should start saying Takbeer (saying: Allaahu Akbar) when he starts to bow and end ...
All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.