This type of workout has a long and colorful pedigree. Legendary runner Emil Zatopek of the Czech Republic, who won the 5,000, 10,000, and marathon at the 1952 Olympics, reportedly ran 20 x 400 with 200-meter recovery every day before the 1948 Olympics, with hard 200-meter repeats before and after. Before the 1952 Games, he upped it to 40 x 400 daily.

Then there was Jim Ryun, the last American to hold the mile world record, who did the same workout in high school in the 1960s (also completing as many as 40 repeats). The 400-meter distance was ideal, Ryun said, because “it’s short enough that you can run pretty fast, but you can recover and do it again and again.” Here’s how to harness the power of repetition in your own training.

Marathon World Record holder Eliud Kipchoge schedules 400m repeats into his training at least once every month - sometimes running workouts such as 25-30 x 400m repeats in 62-64 seconds with 30-60seconds rest. Another common workout Kipchoge incoprorates 400m intervals into is 10 x 800m (in around 2:10) followed by 10 x 400m (in 62-64).

Other elite athletes known to include 400m repeats into their training include Mo Farah, Paula Radcliffe, Kenenisa Bekele, Matt Centrowitz.. the list goes on.

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