<p>This study assessed the effectiveness of wearable device-based training on adolescent anxiety and academic performance using a two-stage approach. The first stage assessed the effects of an eight-week heart rate self-monitoring period using a built-in self-monitoring application on a wearable device. Forty-seven high school students were recruited, and there were no significant interaction effects across the variables. The second stage assessed the effects of an eight-week real-time emotion identification system that required the individual to identify their emotion when their heart rate reached at least 30% above the baseline. Thirty-two high school students were recruited for this stage. Significant interaction effects were found for state anxiety but not academic performance with a significant decrease in anxiety in the experimental group, but not in the control group. Overall, the results showed that focusing on the present moment combined with identifying emotions in real time was effective in reducing adolescent anxiety.</p>