Running at maximum intensity for about an hour will be done at or just below your threshold pace. When an event is longer than this your race pace will be further below threshold at Tempo pace. The best way to prepare the body to handle this intensity is to spend time running at it. This workout is great to include early in your build-up to expose the body to a slightly higher intensity. This is a key workout within the Project 1:50 training plan to help runners achieve the goal of running a ½ Marathon under 1:50hr.
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