Can only be changed by positive influence. Do not fight old habits, learn new ones. Create compression by movement not pressure. Avoid conscious control of lungs. Lungs will rise with low air capacity.
Full breath Requires no diaphragm to evacuate air.
Diaphragm cannot contractup, only down. Move quickly to shorten length of lungs. Let body decrease in size. Think length of torso, not breadth. Mouth should not be more open than throat.