Can simple breathing techniques tune your heart and lungs?

This trial investigates how different breathing exercises—diaphragmatic, square breathing, alternative nostril, and dynamic neuromuscular stabilization—affect lung function and heart rate variability in healthy adults aged 18–30. Participants will practice their assigned technique for 20 minutes, four times a week, over six weeks. Researchers will measure breathing and heart rate responses before, immediately after the first session, and after the training period to see which exercise offers the most benefit.