(4/5) Pairing with a chest strap (recommended) yields reliable HR data. Wrist-based optical sensors (watch mode) lag by ~5–8 seconds during sprints – acceptable but not perfect. Calorie burn estimates are within 10–15% of lab-tested values, which is industry standard.
4/5 – Reliable, effective, but lacks polish in coaching and outdoor features. cardio exe
You thrive on live classes, need outdoor run tracking, or hate monthly fees. (4/5) Pairing with a chest strap (recommended) yields