A genuine belly laugh engages the diaphragm and respiratory system in ways that provide measurable physical and mental health benefits:

: It improves circulation and oxygen consumption, which can lower blood pressure over time and help protect against heart disease.

A belly laugh is a deep, loud, and hearty laugh that often causes the stomach to shake. Beyond just being a sign of intense joy, a true "guffaw" acts as a form of "internal jogging," providing a mini-workout for your heart, lungs, and core muscles. The Science of a Hearty Laugh