Train smarter around the clock with the Amazfit Helio Strap, built for runners who want precise data without extra hassle. It captures continuous, per-second heart rate for deeper insights into training load, recovery, and overall wellness. The lightweight, comfortable design stays put through hard workouts and easy days alike, and the long battery life keeps you tracking nonstop. Seamless integration with Amazfit watches, the Helio Ring, and the Zepp App turns your routine into a full performance ecosystem.