Firstbeat Lifestyle Assessment uses also acceleration data from the Bodyguard 2 device in addition to heart rate to detect stress and physical activity. The acceleration data improves the ability of the analysis to recognize whether an increased activation level in the body is caused by mental stress or physical activity.

This improves the accuracy especially with unfit people, with whom even slight activation can increase the heart rate significantly, and also with very fit people, who typically do not show much of a heart rate reaction to light exercise. The acceleration data is available only when using the Firstbeat Bodyguard 2 device in measurements, and the heart rate data is uploaded to the software directly from the device. The acceleration data is not used in the analysis if the acceleration meter settings have been changed from the default settings.