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Message: <blockquote data-quote="Jones" data-source="post: 669611" data-attributes="member: 4805">Yasso 800's are supposed to a pretty accurate predictor of your marathon time, it's really just a standard 800 workout where recovery time = interval time. The min:sec of your 800's will be about the same as the hour:min of your upcoming marathon. If you can knock out 8-10 800s in 2:50, you should be able to run a marathon in 2:50. Named for for Bart Yasso who figured out the connection.And if I tried to go out and run 20 quarters at <70 I would probably collapse about halfway through <img src="/community/styles/default/xenforo/smilies/tongue.png"  class="smilie" loading="lazy" alt=":p" title="Stick Out Tongue    :p" data-shortname=":p" />. I was never close to being a sub 3:00 guy.</blockquote>