Apple Watch is designed in a way by Steve Jobs that it comes with the best hardware available in the whole market. For example, they have the
digital crown on apple watch to eject water in case if your watch gets wet in the bathroom or any water park place. So let's check out how the watch tracks heart rate.
Apple watch have a green light in the lower side of it, which enables it to track your heart rate in accordance to the heart beat. When the green light blinks, it means that it is tracking your heart rate.