DEAR MAYO CLINIC: Is breathing from your belly beneficial? If so, can you explain why and how to do it? ANSWER: From the day you’re born, you know how to breathe correctly. That means letting the diaphragm — the large, thin muscle just below the rib cage — do the work of drawing air into the lungs and letting it out. It’s known as diaphragmatic or belly breathing, and it’s the most efficient and effective way to…