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There's a difference between fast run and Sprint.
I see a Sprint as a 90% or greater effort.
Like you're really trying to hit top speed not just run at a good pace.
Maybe you could do it once but you won't be able to keep that pace up for a mile.
I was thinking about it in the context of sports, where you do a lot of short sprints broken up by lighter movement.
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I got you.
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