It was five months since I discovered W.S. George’s “100-Up,” and I’d been doing the exercise regularly. In George’s essay, he says he invented the 100-Up in 1874, when he was an 16-year-old chemist’s apprentice in England and could train only during his lunch hour. By Year 2 of his experiment, the overworked lab assistant was the fastest amateur miler in England. By Year 5, he held world records in everything from the half-mile to 10 miles.
The Once and Future Way to Run by Christopher McDougall