“…For monitoring, wearable devices can automatically and continuously collect users' physiological (e.g., temperature, heart rate, respiration rate, and blood pressure) or biochemical indicators (e.g., sweat), monitor the health condition of the human body, and detect physical movements [11,13], activities [9] and contextual information through wearable sensors [18,19], which can be used in various fields such as healthcare [14], fitness, sports, robotics, administration, education [15], and the military. For example, Apple Watch is a popular wearable device that incorporates many fitness and health data tracking functions.…”