Comparing Effects of Intense Breathwork to Meditation on Altered States of Consciousness

Inclusion Criteria: * Healthy adults in Brighton and the surrounding area * Prior experience practising high ventilation breathwork in the form of conscious connected breathing * No history of adverse events during such prior breathwork sessions. Exclusion Criteria: * History of hypotension * Hypertension * Respiratory or cardiovascular problems * Fainting or syncope * Epilepsy or seizures * Panic disorder or panic attacks * Cerebral aneurysm * Pregnancy (and possibility one might be pregnant, trying to get pregnant, or are breastfeeding) * Breathlessness * Bradypnea * Tachypnoea * Any mental/physical issues affecting the ability to engage in breath control activities.