Health & Training Guide
Running with a cold: when to rest, jog easy, or skip the race.
A practical sick-day decision guide for runners using symptoms, effort, wearable signals, and race-week context.
Archive
All Zone Five Labs articles.
Every review, guide, comparison, deal explainer, and training-tech field note currently published on the site.
Race-Week Guide
Why running can feel worse during a taper—and how to avoid panic training.
Separate heavy-leg noise and race anxiety from symptoms that deserve a cautious response.
Training Guide
Why your running pace stopped improving: a practical plateau reset.
Confirm the trend, audit recovery and training, change one useful lever, and retest without adding random intensity.
Race-Week Guide
Should you strength train during taper week?
A fatigue-budget framework for keeping familiar strength work, cutting volume, choosing timing, and arriving at the race fresh.
Race Guide
Why race pace falls apart on hills—and how to pace by effort.
A practical guide to controlling climbs, using descents safely, setting realistic finish-time ranges, and configuring your watch.
Watch Troubleshooting
COROS watch update problems: what to do before—and after—a failed update.
A practical runner checklist for safer firmware updates, frozen screens, boot loops, evidence preservation, and support escalation.
Recovery Guide
Why running feels so hard after a marathon—and how to return safely.
A practical guide to layered post-race fatigue, readiness signs, recovery trends, red flags, and a conservative return to easy running.
Training Guide
When to increase running mileage without turning the build into a setback.
A runner-friendly guide to adding weekly volume safely, using consistency, recovery, long-run control, and wearable trends as readiness signals.
Training Guide
Zone 5 Running Guide: max-effort training without burning out.
How to use short, hard running sessions without letting intensity wreck the rest of your week.
Referral Guide
WHOOP Referral Code: how the free-month offer works and who should use it.
Use Zone Five Labs’ WHOOP referral link, learn what the offer means, and decide whether WHOOP fits your training style.
Deal Explainer
WHOOP free trial guide: what to check before joining.
A practical checklist for evaluating WHOOP trial and referral offers before starting a membership.
Review
WHOOP Review for Runners: recovery context, sleep coaching, and subscription tradeoffs.
A runner-focused WHOOP review covering recovery metrics, sleep, strain, comfort, and where a GPS watch is still better.
Comparison
WHOOP vs Garmin: recovery subscription or full training watch?
A runner-first comparison of WHOOP and Garmin across recovery, GPS, training features, cost, and daily wear.
Comparison
WHOOP vs Oura: wrist-based strain coaching or ring-based recovery tracking?
A practical comparison of WHOOP and Oura for sleep, recovery, comfort, workouts, and daily usability.
Buyer Guide
Best running watches to compare before buying.
A framework for comparing running watches by GPS accuracy, battery life, workout features, maps, display, and app ecosystem.
Buyer Guide
Best recovery tools for runners: what is worth researching first?
A practical recovery-tool guide for runners comparing sleep trackers, HRV apps, compression, mobility tools, and recovery wearables.
Buying Advice
Fitness wearable buying checklist.
A pre-purchase checklist for choosing a fitness wearable without overpaying for features you will not use.
Training Basics
Heart-rate zones for runners.
A simple guide to heart-rate zones, easy runs, tempo work, intervals, and why zones should be calibrated to the athlete.
Recovery Basics
HRV for runners: useful trend or noisy distraction?
A runner-friendly explanation of HRV, readiness scores, trends, and how to avoid overreacting to single-day data.
Gear Guide
GPS watch accuracy guide for runners.
How to judge GPS-watch accuracy across city blocks, trails, tracks, routes, maps, and race-day pacing.
Sensor Guide
Optical heart-rate accuracy: when wrist sensors work and when they fail.
A practical guide to wrist optical heart-rate sensors, chest straps, cadence lock, intervals, and better data habits.
Training Guide
Running power explained: useful metric or extra noise?
What running power means, when it helps runners, and how to compare it against pace and heart rate.
Recovery Guide
Recovery metrics explained: HRV, resting heart rate, sleep, strain, and readiness.
A plain-English guide to recovery metrics used by WHOOP, watches, rings, and training apps.
Comparison
Apple Watch vs Garmin for runners: smartwatch convenience or training depth?
A runner-focused buying guide comparing Apple Watch and Garmin for workouts, GPS, battery, app ecosystem, and daily use.
Race Guide
Race-day wearable checklist for runners.
A pre-race checklist for GPS watch settings, battery, sensors, routes, alerts, and backup pacing plans.