Calories are calculated using your heart rate information (from Apple Watch, Fitbit, Garmin, or Samsung devices). These devices allow for more accuracy when calculating your workout stats because they combine the rate at which you burn calories at rest and your daily activity to estimate your calories burned. Also, with heart-rate data included, it is much more accurate when calculating the estimated calories burned during exercise.

If you don’t have a connected heart rate device, we use your BMI (height, weight) and age, along with the unique intensity profile of each of our workouts to help estimate calories.