The archive
What your watch measures, gets wrong, and leaves unexplained
What each number on your watch is actually measuring, and how far to trust it.
HRV on the Wrist: What Garmin, Polar and Whoop Measure
Garmin averages RMSSD across the whole night, Polar reads the first four hours, Whoop weights the last deep-sleep stage. Three numbers, three methods.
Aug 2, 2026
Race Predictors Compared: Garmin, COROS, Polar and Runalyze
Garmin, COROS, Polar and Runalyze all project one fitness number across distances. Our 85-athlete data puts Garmin's fade at 1.131 against Riegel's 1.06.
Aug 2, 2026
Whose Sleep Score Should You Trust? Garmin, Whoop, Oura, Apple
Apple weights duration 50, consistency 30, interruptions 20. Garmin folds in HRV recovery, Oura names seven contributors, Whoop four. What each can know.
Aug 2, 2026
Body Battery, HRV Status, Sleep Score: Three Metrics or One?
We ran within-athlete correlations on 85 Garmin athletes. Body Battery, HRV and sleep score move together at rho 0.67-0.68, and not one athlete contradicted it.
Aug 1, 2026
Should You Trust Garmin's Recovery Time? What the Data Says
We have no study on the recovery counter itself. But we tested its closest sibling across 5,136 paired runs, and the result changes what the number is for.
Aug 1, 2026
Does Your Garmin Sleep Score Predict Tomorrow's Run?
We matched 7,492 steady runs to the previous night's Garmin sleep score. Median correlation with next-day running efficiency: 0.04. Here's what that means.
Aug 1, 2026
Does Garmin Training Readiness Predict Anything? We Checked
We matched 5,136 steady runs to that morning's Training Readiness score. Median correlation with running efficiency: 0.056. What the score does track instead.
Aug 1, 2026
Is Garmin's VO2 Max Accurate? We Tracked 14,919 Changes
Almost nobody checks their watch against a lab, so we measured how the number behaves instead: 14,919 VO2 max steps from the cohort with 180+ days of history.
Aug 1, 2026
Whose Recovery Score Should You Trust? Garmin, Whoop, Oura
Body Battery, Whoop Recovery and Oura Readiness are unpublished formulas over the same few signals. Our 82-athlete Garmin data shows how much they overlap.
Aug 1, 2026
Garmin Training Load Too High: Causes and How to Fix It
Why Garmin keeps flagging your training load as too high, what the algorithm actually measures, and how to tell real overreaching from a misread metric.
Apr 16, 2026
How Accurate Is Garmin's Lactate Threshold? And How to Use It
How Garmin estimates lactate threshold from heart rate and pace, how close it gets to lab testing, and how to turn the number into zones that hold up.
Apr 13, 2026
Garmin Running Dynamics Explained: Which Metrics Actually Matter?
Ground contact time, vertical oscillation, stride length and vertical ratio: what each Garmin running dynamic means, which predict performance, which do not.
Apr 13, 2026
How to Improve Your Garmin VO2 Max (Without Gaming the System)
Your Garmin VO2 max is stuck or declining? Here are 7 evidence-based ways to genuinely improve it, and why gaming the number is counterproductive.
Mar 12, 2026
How to Set Garmin Heart Rate Zones (the Defaults Are Wrong for Most)
Garmin defaults to 220-minus-age, which can miss your real max by 20 bpm. How to set heart rate zones from your own data, and when not to trust one test.
Mar 11, 2026
Garmin Acute vs Chronic Training Load: The Load Ratio Guide
Learn how to use Garmin's acute and chronic training load ratio to train smarter, avoid injury, and peak for races. The 0.8-1.3 sweet spot explained.
Mar 10, 2026
Garmin Body Battery Not Charging Overnight (or Stuck at 5)? Here's Why
Stuck at 5, not charging overnight, or draining too fast? The three failure patterns, what each one means, and the five fixes that restore accuracy.
Mar 9, 2026
Garmin Endurance Score vs Stamina vs VO2 Max: What Each Tells You
Confused by Garmin's endurance score, stamina, and VO2 max? Learn what each metric measures, how they differ, and which one actually matters for your training.
Mar 9, 2026
Garmin HRV Status: Why It Says 'Low' When You Feel Fine
How Garmin computes HRV status, why it flags low after alcohol or poor sleep, when the warning is real, and when the watch is more honest than how you feel.
Mar 9, 2026
Garmin Performance Condition: What It Actually Tells You
Performance condition pops up mid-run with a number you might ignore. Here's what it measures, why it matters, and how to use it in your training.
Mar 9, 2026
Garmin Recovery Time Way Too High? Here's What's Going On
Your Garmin says you need 72 hours of recovery after an easy run? Here's why recovery time overshoots and how to calibrate it for better accuracy.
Mar 9, 2026
Garmin Respiration Rate: What It Means for Your Training
Garmin tracks your breathing rate 24/7 but most athletes ignore it. Here's why respiration rate matters and what changes in your baseline actually mean.
Mar 9, 2026
Garmin Stress Score Explained: What It Means and Why It's Always High
Your Garmin stress score seems stuck at high levels? Learn exactly how stress tracking works, what causes elevated readings, and when to actually worry.
Mar 9, 2026
Garmin Suggested Workouts: Are They Any Good? (Honest Review)
Garmin daily suggested workouts promise to adapt to your fitness and recovery. An honest look at what they get right, what they miss, and who should use them.
Mar 9, 2026
Garmin Training Effect: What 3.0 vs 5.0 Means — and When to Ignore It
Aerobic versus anaerobic Training Effect, what a good number looks like for each session type, and why a 5.0 is usually not the win it appears to be.
Mar 9, 2026
Why Your Garmin VO2 Max Is Wrong (And How to Fix It)
Your Garmin VO2 max seems too high, too low, or stuck? Here's exactly how the estimate works, why it goes wrong, and 6 ways to improve accuracy.
Mar 9, 2026
Garmin Race Predictor Accuracy: Why It's Off and How to Fix It
We tracked 22,422 daily race predictions over a year. The predictor missed training runs by 20% but called real races within 1%. What that means for your goal time.
Mar 8, 2026
Garmin Training Readiness Always Low or Stuck at 1? 6 Fixes That Work
Stuck at 1, or always low when you feel fine? The inputs Garmin uses, which one is usually the culprit, and six fixes with a realistic timeline for each.
Mar 7, 2026
How to Use Garmin Training Status and Training Load
Master Garmin Training Status and Training Load metrics. Learn what each status means, how load is calculated, and how to optimize your training.
Feb 17, 2026
Understanding Garmin Body Battery: The Complete Guide
Learn how Garmin Body Battery works, what the numbers mean, and how to use it for smarter training decisions. Complete guide for Garmin athletes.
Feb 10, 2026
