How to Run, 1836
The tread is neither with the mere balls of the toes, nor with the whole sole of the foot; and the spring is made rapidly from one foot to the other, so that they pass each other with great velocity… A mile in five minutes is good running. Two miles in ten minutes is oftener failed than accomplished. Four miles in twenty is said to puzzle the cleverest.
Donald Walker, British Manly Exercises
It’s hard to focus on division problems when you’re dashing around in a top hat, but take it from The Past: if you can run four miles in twenty minutes, you are a genius.