Concept
Long run
A deliberately longer session used to develop time-on-feet durability, fueling practice, and confidence for endurance goals.
Its purpose changes
A long run may be easy throughout, include controlled specific work, or focus on practicing fueling and equipment.
Why progression matters
The useful length depends on current weekly volume and recovery, not only the target race distance.
Why it is not a weekly race
Frequent aggressive long runs can create more fatigue than the rest of the week can absorb.
How to use it
Choose one clear purpose, keep the size proportional to current training, and review recovery before extending it.
Common misconception
The longest possible run is not automatically the most useful long run.