- Calculate your max heart rate (based on age, or override if you know it)

- Build your own workout on your phone, send it over to your Samsung androidwear watch - you can then leave your phone at home

- App uses the heart rate monitor from the watch and displays in green when you are in correct zone, orange if 1 zone off, or red otherwise

- Shows an ongoing notification when running, so you can still use other functionality on the watch - e.g. change music track