This question is really boring ... ancient primitive people climbed mountains and waded for food when hunting, but in the struggle between people or between people and animals, swimming was the most basic skill in order to survive. Before 9000 AD, murals of swimmers' swimming movements were found in the Wadi Seri cave in the Libyan desert, showing that in ancient times, humans had the skills to swim in the water. In the relief of Assyrian relics preserved in the British Museum, there is a scene in which the defeated Hittites fled across the river in the15th century war. It is known that there were skills such as side swimming, agile swimming and life-saving on water. From this point of view, it is one of the earliest primitive people to learn!