The STAR technique is a mindfulness exercise that can be done in 1 minute to help reduce stress levels throughout the day. It involves asking yourself how you are feeling, taking 3 deep breaths, and returning to a calmer state. Integrating STAR into the day by setting reminders at times like 11:30, 15:30, and 20:30 allows you to do a mini check-in and gradually decrease stress levels over time.