Built around one question
Does this long run make a 4:20 marathon feel more believable, less believable, or still uncertain?
Personal portfolio project
Marathon long-run analytics for COROS runners.
Long Run Lab uses COROS activity data to explain whether a marathon long run supports a target race goal. The first version is non-commercial and focused on evidence from completed training runs.
24 km long runConfidence: uncertain
Target band6:05-6:20/km
Marathon goal4:20
Pace stayed controlled, but heart rate drifted upward after the downhill first hour. Humidity and later hills likely affected the cost.
Target pace context
The app evaluates evidence around 6:10/km, using a practical band of 6:05-6:20/km instead of treating one exact split as magic.
Readable debriefs
The goal is not another generic dashboard. The output should explain pace stability, heart-rate cost, terrain, humidity, and recent fatigue in plain language.
Analysis signals
What the first version will inspect
- Goal-pace evidence
- Aerobic drift
- Late-run fade
- Elevation context
- Previous 7-day load
- Manual key-run notes