It was narrated that ‘Ali (رضي الله عنه) said: The Messenger of Allah (ﷺ) was neither tall nor short, he had a large head, a big beard and large hands and feet. His face had a reddish colour; he had a long thin line of hair from the top of his chest to his navel; and he had large joints. When he walked, he walked energetically as is walking downhill, I never saw anyone like him before or since,
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا وَكِيعٌ، أَنْبَأَنَا الْمَسْعُودِيُّ، عَنْ عُثْمَانَ بْنِ عَبْدِ اللَّهِ بْنِ هُرْمُزَ، عَنْ نَافِعِ بْنِ جُبَيْرِ بْنِ مُطْعِمٍ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ قَالَ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَيْسَ بِالطَّوِيلِ وَلَا بِالْقَصِيرِ ضَخْمُ الرَّأْسِ وَاللِّحْيَةِ شَثْنُ الْكَفَّيْنِ وَالْقَدَمَيْنِ مُشْرَبٌ وَجْهُهُ حُمْرَةً طَوِيلُ الْمَسْرُبَةِ ضَخْمُ الْكَرَادِيسِ إِذَا مَشَى تَكَفَّأَ تَكَفُّؤًا كَأَنَّمَا يَنْحَطُّ مِنْ صَبَبٍ لَمْ أَرَ قَبْلَهُ وَلَا بَعْدَهُ مِثْلَهُ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ.
sunnah.com