It was narrated that ‘Ali (رضي الله عنه) said: The Messenger of Allah (ﷺ) was neither short not tall; he had a large head and beard, large hands and feet, large joints, a reddish face, and a long line of hair from his chest to his navel. When he walked he walked energetically, as if lifting his feet from a rock. I have never seen anyone like him before or since, may the blessings and peace of Allah be upon him.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا مُجَمِّعُ بْنُ يَحْيَى، عَنْ عَبْدِ اللَّهِ بْنِ عِمْرَانَ الْأَنْصَارِيِّ، عَنْ عَلِيٍّ، وَالْمَسْعُودِيُّ، عَنْ عُثْمَانَ بْنِ عَبْدِ اللَّهِ بْنِ هُرْمُزَ، عَنْ نَافِعِ بْنِ جُبَيْرٍ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ قَالَ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَيْسَ بِالْقَصِيرِ وَلَا بِالطَّوِيلِ ضَخْمَ الرَّأْسِ وَاللِّحْيَةِ شَثْنَ الْكَفَّيْنِ وَالْقَدَمَيْنِ ضَخْمَ الْكَرَادِيسِ مُشْرَبًا وَجْهُهُ حُمْرَةً طَوِيلَ الْمَسْرُبَةِ إِذَا مَشَى تَكَفَّأَ تَكَفُّؤًا كَأَنَّمَا يَتَقَلَّعُ مِنْ صَخْرٍ لَمْ أَرَ قَبْلَهُ وَلَا بَعْدَهُ مِثْلَهُ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ و قَالَ أَبُو النَّضْرِ الْمَسْرُبَةُ وَقَالَ كَأَنَّمَا يَنْحَطُّ مِنْ صَبَبٍ و قَالَ أَبُو قَطَنٍ الْمَسْرُبَةُ و قَالَ يَزِيدُ الْمَسْرُبَةُ.
sunnah.com