Nafi' narrates from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) held a race between conditioned (lean-trained) horses from al-Hafya' to Thaniyyat al-Wada', and held a race for the horses that had not been conditioned from Thaniyyat al-Wada' to the mosque of Banu Zurayq; and Sayyiduna Ibn Umar (may Allah be pleased with them both) was among those who raced in it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السبق والرمي / 19752