Insert the mouthpiece of the device into your mouth and seal with lips.
If unable to keep your nose blocked off a gentle nose plug can be used to assist.
Take a slow breath in the mouth and watch as the mobile pistons rises.
Adjust the force of the inspiration to reach your target level of pressure. Try keeping the piston at the target level throughout the full breath in. Breathe out easy and then repeat.
Take breaks as needed, especially if you feel lightheaded or dizzy.
