KULG aerobic fitness score

KULG App

Mar 20

We’ve introduced a new Aerobic fitness score in KULG App to help runners better understand their endurance development. This makes it easier for runners to track their running progress, monitor adaptations, and understand changes in aerobic fitness.

Aerobic fitness score is calculated using long-term heart rate vs speed trends, comparing the runner’s rolling yearly weekly range to the training patterns for the last 7-8 weeks. This provides a clearer picture of how efficiently the body performs over time.

The score is displayed on a simple 0–5 scale. A higher score means the recent weekly aerobic fitness is stronger compared to your rolling one-year baseline. The % change indicates how the last 8-week score has changed compared to the 8 weeks before.