It is narrated from Sayyiduna Khalid Abu Nafi' al-Khuza'i (may Allah be pleased with him) that whenever the Messenger of Allah (peace and blessings be upon him) led the prayer while the people were watching, he would lead a light prayer, yet complete in its bowing (ruku') and prostration (sujud).
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4098