Do I need a running watch if I have a smartwatch?

For casual running, no — Apple Watch and Samsung Galaxy Watch track runs adequately. For training improvement, yes — dedicated running watches offer training load, race predictions, running dynamics, and multi-day GPS battery that smartwatches cannot match.

How accurate is wrist-based heart rate during running?

Modern optical sensors are 95%+ accurate during steady-state running. Accuracy drops during intervals and wrist movement. For maximum accuracy during HIIT and interval work, pair with a chest strap like the Garmin HRM-Pro Plus.

Best GPS Running Watches 2026