A method includes determining that a portable apparatus is in an exercise mode； obtaining, by the portable apparatus when in the exercise mode, real-time exercise data of a user of the portable apparatus acquired using a sensor set having one or more sensors, and reference data related to the exercise mode； observing, when in the exercise mode, the real-time exercise data, and detecting, during the observing based on comparison of the real-time exercise data with the reference data, that at least one value of the exercise data is uncharacteristic to the exercise mode； and determining, when in the exercise mode, whether the detection of the at least one uncharacteristic value is related to an unpredicted incident, and as a response to the determining that the detection of the at least one uncharacteristic value is related to the unpredicted incident, causing an output of an emergency signal.
