It is narrated from Sayyiduna Jabir bin Abdullah al-Ansari (may Allah be pleased with him) that he said: I saw the Prophet (peace and blessings be upon him) offering voluntary prayers on his mount facing every direction, but he (peace and blessings be upon him) would bend lower in prostration than in bowing. He would offer the prayer (on the mount) by gestures.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2210