A posture-monitoring system for monitoring a body posture of a user includes an array of wirelessly locatable tags, including a first tag configured to be positioned along a first shoulder region of the user and having a first battery and a first wireless circuit configured to transmit a first locating signal, a second tag configured to be positioned along a second shoulder region of the user and having a second battery and a second wireless circuit configured to transmit a second locating signal, and a third tag configured to be positioned along a back region of the user and having a third battery and a third wireless circuit configured to transmit a third locating signal. The posture-monitoring system further includes a portable electronic device including a processing unit and a wireless circuit operably coupled to the processing unit and configured to receive the first, second, and third locating signals.