Quotation from: The Notebooks of Leonardo Da Vinci
Written by: Leonardo da Vinci
OF THE WAY OF WALKING IN MAN.
The walking of man is always after the universal manner of walking
in animals with 4 legs, inasmuch as just as they move their feet
crosswise after the manner of a horse in trotting, so man moves his
4 limbs crosswise; that is, if he puts forward his right foot in
walking he puts forward, with it, his left arm and vice versa,
invariably.