this post was submitted on 13 Feb 2026
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I'm curious who exactly the article is debunking? Because I've never heard zone 2 described as anything other than what they're saying. It allows you to do long runs, and to recover from harder runs, but the fact that it doesn't replace speed work seems self-evident.
Judging by this quote, I assume the author is referring to people who just train in zone two. Though, if you know there's a zone 2, it follows that you would know that there's other zones that you should be training in too.