Methods and devices for executing a computerized talk test, comprising: following an exercise program; providing auditory signals from time to time; recording a user talking according to the auditory signals; analyzing the recordings to identify predefined properties; and providing an indication of the user's current heart rate training zone based on the analysis results. Other embodiments discuss a device configured to determine when a user approximately sustains a fixed level of physical effort and then execute a computerized talk test, and a device configured to identify a user's heart rate training zone based on identification of involuntary interruptions in the user's voice speech.