Stress is an unavoidable part of modern society. According to the 2023 World Health Survey, more than 70% of adults reported stress as a major health issue. In this reality, various methods are being suggested to find peace of mind, and among them, breathing exercises are gaining attention as the simplest yet most effective method. Breathing exercises are beneficial for lowering heart rate, controlling blood pressure, and relieving tension. In particular, regular breathing exercises reduce physiological stress responses and provide mental stability. Common breathing exercises include 'diaphragmatic breathing', '4-7-8 breathing technique', and 'box breathing'. Diaphragmatic breathing is a technique often used in meditation or yoga, involving deep breathing by filling the abdomen with air. This method is easy to learn and provides an immediate calming effect. When attempting diaphragmatic breathing, one should take a comfortable posture and slowly inhale through the nose, feeling the abdomen expand. Then, exhale slowly through the mouth while contracting the abdomen. The '4-7-8 breathing technique' is effective in reducing anxiety and improving sleep quality. This method was introduced in a study by Harvard Medical School and is recommended for those struggling with sleep deprivation. It involves inhaling through the nose for 4 seconds, holding the breath for 7 seconds, and then exhaling for 8 seconds. Meanwhile, 'box breathing' is a technique used by Navy SEALs, allowing for both concentration and stress management. This method consists of inhaling for 4 seconds, holding the breath for 4 seconds, exhaling for 4 seconds, and pausing for 4 seconds. This repetitive process helps calm the mind and relieve tension. The effects of breathing exercises may not be noticeable in the short term, but consistent practice can bring significant changes to one's mindset. Studies show that people who regularly practice breathing exercises have an average of 30% lower anxiety levels than those who do not. Incorporating breathing techniques into daily life can increase work efficiency and reduce stress in interpersonal relationships. On the journey to finding peace of mind, the 'Daily Certification' app helps you form habits. Add breathing exercises to the app's daily checklist to create a habit of maintaining a healthy mind.