the.com/fitness
The lifelong project of being able to run from your problems faster.
means The condition of being physically capable, healthy, and conditioned enough to meet life's demands.
from From fit, an old word for suitable or proper; fitness once meant simple appropriateness before Darwin and gyms recruited it into bodies and survival.
Darwin's phraseSurvival of the fittest meant best-suited, not strongest.
Resting metricLower resting heart rate often signals better fitness.
Word driftFitness meant suitability long before treadmills existed.