Heart Graph uses a short, standard “reference set” to help fairly compare workouts. Your heart rate from a reference set at the start of every workout provides a constant baseline, while a reference set at the end of the workout can suggest how much impact that workout has had on your body. This tutorial shows you how to create the baseline heart rate graphs to compare future workouts against.

If you are trying to import data from Apple’s Health app (e.g., to graph existing data from your Apple Watch), you must first ensure that Heart Graph has permission to access the necessary information.