Hi all! I am using my apple watch for cardio and workout and I am now looking for something that I assumed was easy to find, but that I found difficult to get: I want to maintain my heart rate in a specific zone, with a low and a high. I though Heartwatch allowed for that, but either I can't find out how to do it, or it doesn't. Any of you know of an app where I would set a low and high heart rate and I would get an alert if I get close to, or break either limit? This sounds so useful for people who want to workout in the aerobic or fat burning zone that I always assumed someone must have made one already. Thanks for your help!