2 of 2 Fix typo; improve formatting

Why do we use the word “sprint”?

One of the founding principles of the Agile Manifesto is

Agile processes promote sustainable development. The sponsors, developers, and users should be able to maintain a constant pace indefinitely.

Scrum teams use the term sprint to refer to a work cycle (also known as an iteration).

However this doesn't make sense to me. According to Google a sprint is:

run at full speed over a short distance.

In other words it's not sustainable. Why do Scrum teams use the word sprint? It appears to me to conflict one of the basic principles of Agile.