This breathing technique refers to slow and deep breathing. The most effective muscle for breathing is the diaphragm, which is found near the base of the lungs – for those with healthy lungs, it performs roughly 80% of the work required to breathe. When practicing diaphragmatic breathing, you tighten your abdominal muscles and expand your upper chest as you inhale slowly and consciously take deep breaths. This is an excellent way to learn breath control. Breathing deeply helps you get more oxygen into your central nervous system; therefore, reducing blood pressure and your heart rate.