Great endurance workout from Jerred Moon. Can really help you get a sense of pacing as well.

It takes over an hour though: 20 400m runs, with 2 min. rest between each one.
Miles 1, 3 and 5: Work pace
Miles 2 and 4: Rest pace (5 seconds slower)
Watch the video to see how to do it:

https://www.youtube.com/watch?v=57TDXpaTwzU

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