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[[File:Emil Zátopek.jpg|right|thumb|300px|Emil Zátopek racing.]]
While most [[Interval Training|interval training ]] is done at high intensity, it is possible to run them at a lower intensity, which allows for correspondingly higher volumes.
=Emil Zatopek=
This approach was used by [http://en.wikipedia.org/wiki/Emil_Z%C3%A1topek Emil Zatopek] was a runner who set world records and won Olympic Gold medals. Emil is reported to have run up to 100x (400m + 200m recovery), with the 400m a few seconds slower than his 10K pace. That works out as a 37 mile workout, with 25 miles at close to 10K pace. While this level of workout is beyond most recreational runners, doing a larger volume of medium intensity intervals should be considered by experienced athletes.