Free tool
Interactive guide to HRV, Body Battery, Training Status, VO2max, and more. Finally understand what your watch is telling you.
Select a metric to learn about
Athlin pulls all this data automatically from your Garmin — and your coach sees the trends that matter, without asking you for screenshots.
Coaches: see every athlete's Garmin data in one dashboard
Try Athlin free — forever for founding trainers8 quick questions about sleep, energy, and performance. Get your overtraining risk score.
Get all 5 training zones from your heart rate data. Works for running, cycling, and swimming.
Find out if your training is on track for your goal race. Honest readiness score based on your volume.
HRV (Heart Rate Variability) is the single most useful metric for training decisions. It reflects your nervous system's recovery state and catches overtraining before you feel it. Track the 7-day trend, not individual daily readings.
'Unproductive' means you're training hard but not getting fitter. This usually means you're not recovering enough between sessions. The fix is usually better sleep, easier recovery days, or a deload week — not more training.
Garmin's VO2max estimate is typically within 5% of lab-tested values for running, less accurate for cycling. It's most useful as a trend indicator — track changes over months rather than trusting the absolute number. Heat, altitude, and fatigue can temporarily lower readings.