The exhale is a short, sharp pump of the lower belly; the inhale happens by itself. Rest a full minute between sets.
Keep in mind
Empty stomach only, ideally morning. Stop immediately if dizzy.
Avoid if: Pregnancy, menstruation, high blood pressure, heart conditions, hernia, recent abdominal or chest surgery, glaucoma or detached retina, epilepsy, vertigo, peptic ulcer, or any active respiratory infection.