Garmin
Garmin Fenix 8
Spanwise Verdict
The Garmin Fenix 8 is our top-rated wearable for longevity-focused individuals. Its combination of accurate VO2 max estimation, detailed HRV tracking (including overnight HRV status), advanced sleep staging, and granular training load metrics is unmatched. The Training Readiness score synthesizes sleep quality, recovery, training load, and HRV into a single actionable number each morning. Zone 2 heart rate alerts make it trivially easy to stay in the optimal aerobic training zone. Battery life measured in weeks — not hours — eliminates the anxiety of daily charging and enables continuous 24/7 monitoring. If you are tracking one device for health and performance, this is it.
Overview
The most capable fitness and longevity wearable available. The Fenix 8 provides research-grade VO2 max estimation, continuous HRV monitoring, advanced sleep staging with sleep score and body battery, Training Readiness and Training Status metrics, and built-in heart rate zone training including zone 2 alerts. For anyone serious about tracking their fitness and recovery longitudinally, it is the gold standard.
Pros
- Best-in-class VO2 max estimation validated against clinical testing — the single most important longevity metric
- Advanced sleep staging (light, deep, REM) with sleep score, Body Battery, and overnight HRV status
- Training Readiness score integrates sleep, stress, recovery, and training load into one actionable metric
- Multi-week battery life enables uninterrupted 24/7 monitoring — no daily charging interruptions
- Built-in heart rate zone alerts for precise zone 2 training without a chest strap
Cons
- Premium price point at $999+ puts it out of reach for casual users
- Large watch face may not suit smaller wrists or formal settings
- Feature depth can feel overwhelming — significant learning curve for new users
- ECG and blood oxygen features vary by market due to regulatory approvals