It is narrated from Abu Qilabah that Sayyiduna Malik bin al-Huwayrith (may Allah be pleased with him) said to his companions: "Shall I not show you the manner of the prayer of the Messenger of Allah (peace and blessings be upon him)?" At that time it was not the time of an obligatory prayer either. He stood, then bowed, then raised his head from bowing and remained standing for a little while, then prostrated, then raised his head from prostration and paused for a little while, then made the second prostration.
Abu Qilabah said: He prayed like our Shaykh Amr bin Salamah (may Allah be pleased with him).
Ayyub said that Amr bin Salamah (may Allah be pleased with him) used to do something that I have not seen other people doing: when he rose from both prostrations in the first and third rak'ahs, he would sit up straight, and then after that he would stand up.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2746