`Ali b. Abu Talib said:
God's messenger was neither tall nor short, he had a large head and beard, the palms of his hands and his feet were calloused, he had a reddish tinge, he had large joints, the hair on his breast was long, and when he walked, he bent forward as though he were descending a slope. I have never seen anyone like him before or since.
Tirmidhi transmitted it, saying this is a hasan sahih tradition.