The journeys of Leander across the Hellespont are well celebrated in verse and prose, but this feat has been easily accomplished many times since, and is hardly to be classed as extraordinary.

Herodotus says that the Macedonians were skilful swimmers; and all the savage tribes about the borders of waterways are found possessed of remarkable dexterity and endurance in swimming.
In 1875 the celebrated Captain Webb swam from Dover to Calais.

On landing he felt extremely cold, but his body was as warm as when he started.

He was exhausted and very sleepy, falling in deep slumber on his way to the hotel.

On getting into bed his temperature was 98 degrees F.and his pulse normal.