A few weeks ago, I did some very short, high-intensity sprints in the middle of a zone two bike ride.  The sprints left me feeling exhausted far more than they should have, so I thought it was probably a good idea to do two things: get some more low-intensity aerobic training in and to simultaneously work on some really high intensity interval work.  This post explains why this might not be a bad idea after a couple of weeks of hard racing.

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