Garmin Watches

Why Garmin matters for longevity tracking

Garmin pioneered the VO₂max estimate for consumer wearables via Firstbeat algorithms. Estimates are decent for outdoor running with GPS + HR; less accurate for other activities.

Also strong on:

• Heart-rate variability tracking (overnight + on-demand).
• Body Battery (recovery-state proxy).
• Training-status modelling (productive / overreaching / maintained).
• Sleep tracking (reasonable, not best-in-class).
• Resting heart rate trends.
• Endurance-pursuit GPS for running, cycling, swimming.

Trade-offs vs competitors

• More technical and less consumer-friendly UI than Apple Watch / Fitbit.
• Better battery life than Apple Watch.
• Better sport-specific features than Oura/WHOOP.
• Less polished sleep tracking than Oura.

Reasonable use cases

• Endurance athletes.
• Tracking VO₂max estimates for longevity.
• Anyone valuing long battery life (1–3 weeks on Fenix).
• Outdoor adventure with GPS / topo maps.

VO2max estimate caveats

Garmin VO₂max estimates are useful for tracking change over time but should not be treated as a substitute for a CPET (cardiopulmonary exercise test) in a clinical setting. Absolute values often run high relative to lab measurement.

Related entries

VO2max, HRV, Exercise, Oura Ring.