This is one of the best workouts to improve your endurance and improve your 1500 - Marathon.

A half marathon or marathon runner may want to increase the volume of the session by adding a 2K at the start with an extra 2K float, even further you could add a 3K and 2K float which would total 19K. With the 3K being marathon pace, and the 2K being half marathon pace and not getting down quite as quick in the 1200 and 800m reps.

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