Easy runs are the part of training that quietly produces all of the fitness while the hard sessions get all of the credit. The principle is simple: keep them easy, and the rest of training works.
What 'easy' means
Conversational, Zone 2, RPE 3 to 4, nasal breathing comfortable. Slower than feels productive. That is the point.
KYN
An easy day that stays easy
KYN will warn you when your 'easy' run drifted into tempo.
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