Procedure
depressive, sleep disturbance, anxiety
Delivery was remotely through private audio links. Both groups were also provided with an identical ~ 5 min study introductory/welcome audio, to listen to on the first day. Participants were sent daily reminders via Prolific to practise their breathwork and keep a record of whether they had practised each day, along with reminders to complete the online surveys when necessary. Informed consent was obtained from all participants included in the study, and they were paid to complete the surveys at the Prolific-recommended rate of 9GBP/hour. All participant data were anonymous (only Prolific user IDs seen). The primary outcome was subjective stress (see below) and primary timepoint was post-intervention. Levels of stress were measured pre-post intervention and follow-up (immediately before the intervention, immediately after, and four weeks after the intervention). Secondary outcomes of subjective anxiety, depressive symptoms, wellbeing and sleep disturbance were also measured at the same timepoints (pre-post-follow-up). In addition, after the first session of practising breathwork, self-reported credibility and expectancy of the breathwork protocols for both groups were measured. Finally, self-reported adherence to the breathwork was measured at post-intervention.