I use my watch to track my heart rate, so I have the default screen set up to show me the heart rate at a glance. However, when I am in the middle of an activity, it will not show me my heart rate. It switches to calories burned (which is not info I'm interested in), and even if I swipe through all the screens, it still does not show me my heart rate again until the activity is over and it has returned to normal. Is there a way to change this so I can see my heart rate during an activity? It seems like an obvious thing it should be able to do, but I haven't been able to figure it out.