Apple Fitness is a great starting point, but its charts are built for casual glances, not serious training decisions.
DATOM reads directly from your HealthKit data (including all your past workouts) and unlocks a level of analysis Apple simply doesn't offer: infinitely zoomable charts, synchronized maps, dual-axis metric comparisons, Training Stress Score, shoe mileage tracking, and long-term trend analysis.
You've already done the work. Now see it the way it deserves to be seen.