Whether you're doing a Zone 2, 4 or whatever type of workout, are you tired of constantly looking at your Apple Watch to monitor your heart rate? ZonePRO solves this by announcing your heart rate every time it changes. Launch ZonePRO on your Apple Watch and start a workout. No need to look at your Apple Watch to see what your heart rate is. Just that simple. View your workout stats on your iPhone that's paired with your Apple Watch.