وَالِاعْتِدَالُ عِنْدَ التَّحْرِيمَةِ مِنْ غَيْرِ طَأْطَأَةِ الرَّأْسِ
At the opening Takbir, remain upright without deliberately bowing or drooping the head. This is a posture Sunnah; it should not be confused with the separate validity rule that the opening Takbir of a Fard prayer is given while standing when one is able.