Learn More
The runner's reference
Professional-grade running guides — training zones, pace guides, glossary, and calculators. The same knowledge built into Apex Run, now readable anywhere.
Running Glossary
Key running metrics used in Apex Run, explained in plain language — VO2 Max, cadence, stride length, ground contact time, vertical oscillation, training load, ACWR, GAP, and more.
Training Zones
How heart rate zones and pace zones work in Apex Run — set up your 5 HR zones and E/M/T/I/R pace zones to train at the right intensity and hit your race goals.
80/20 Training Structure
Why elite runners spend 80% of their time running easy — and how Apex Run's Training Structure insight helps you apply the same polarized training principle to avoid the black hole and run faster.
Pace Guide
What running pace means, the difference between average, instant, and split pace, and how to use Apex Run's pace calculator to plan your next race or training run.
Pace Calculator
Free online running pace calculator — instantly calculate your target pace, estimated finish time, or distance for 5K, 10K, half marathon, and marathon. Built into Apex Run.
Race Predictor
Apex Run's race predictor automatically forecasts your 5K, 10K, half marathon, and marathon finish times using Riegel's Formula calibrated to your last 6 weeks of real training data — no manual input required.