Not only does the diaphragm afford steady and even breathing, but it also has an enormous influence on blood and lymph circulation in the body, which has not been thoroughly investigated yet. In our everyday lives, the diaphragm functions in coughing, throwing up, or when we go to the bathroom. This is also where the cause for hiccups lies, which is a row of involuntary contractions of the muscles in the diaphragm.
The most important function of the diaphragm, however, remains to be the ventilation of the lungs. Nonetheless, only a few use it optimally, and many are thus cheated of the physical benefits a correct usage can provide. But with only a few daily exercises you can become best friends with your diaphragm.