Given what we know, we can confirm that the exercise routine described in the question is a prime example of an athlete training in zone 5.
What is training zone 5?
This is a division of training that measures and improves upon a very specific goal. This training zone indicates the athlete should train at the maximum effort in order to measure and improve upon his/her maximum speed. This is especially important for track athletes.
Therefore, we can confirm that A track athlete completing 4, 100-meter sprints as hard as they can with 5 minutes rest in between each one is an example of training in zone 5.
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