In daily breathing, when inhaling, the diaphragm will descend and all internal organs will descend. On the contrary, when exhaling, the abdominal muscles contract again, the diaphragm returns to a relaxed state, the diaphragm rises, and the perineum will also lift up.

If air is deliberately sucked into the lungs, it will cause the diaphragm to press down, and the forced contraction of abdominal muscles will suddenly increase the pressure in the abdominal cavity.

In addition, studies have confirmed that intentional inhalation will also increase the pressure on the intervertebral disc.

In fact, in order to reduce the effect of gravity and not waste time on the lower abdomen and perineum, all forces should be exerted when the diaphragm rises, that is, the exhalation of physiological breathing.