Hazrat Aisha (may Allah be pleased with her) narrates that when the Messenger of Allah (peace and blessings be upon him) performed ruku, he would not lower his blessed head below his back nor raise it above, but would keep it in a position between the two. When he raised his head from ruku, he would not go into prostration until he stood up straight in an upright position. And when he raised his head after prostration, he would not perform the second prostration until he sat in a state of calmness. After every two rak‘ahs, he used to recite at-Tahiyyat.