Hazrat Abdullah bin Shaqiq narrates that I asked Sayyida Aisha (may Allah be pleased with her) about the manner of the Prophet’s (peace and blessings be upon him) voluntary prayers. She replied that the Prophet (peace and blessings be upon him) would pray for a long time standing at night, and he would also pray for a long time sitting. So, when he recited while standing, he would also perform bowing (ruku) and prostration (sajdah) standing, and when he recited while sitting, he would also perform bowing and prostration sitting.