Concept
Aerobic base
The repeatable endurance capacity that supports longer running, recovery, and later higher-intensity training.
How it develops
Consistent easy and controlled running gradually improves the ability to sustain work and recover from it.
How it appears
Comparable runs may feel easier, show less drift, or become slightly faster while recovery remains stable.
Why it supports speed
A stronger base helps absorb quality sessions and preserve performance later in longer efforts.
How to use it
Build it through repeatable weeks, then judge progress from comparable runs and recovery rather than one test.
Common misconception
Aerobic base is not one heart-rate zone, one slow pace, or a phase that advanced runners permanently finish.