https://stayprepared.sg/mymentalhealth/articles/breathe-your-way-to-better-mental-health/

https://www.healthline.com/health/get-serious-about-severe-asthma/breathing-exercises-severe-asthma?slot_pos=article_2&utm_source=Sailthru%20Email&utm_medium=Email&utm_campaign=generalhealth&utm_content=2022-04-08&apid=36929682&rvid=cded95459555b445d044db2977410c97aa2ce21d0688c96624f02c326c3915c1#1.-Diaphragmatic-breathing

https://www.theepochtimes.com/how-to-breathe-to-stay-well_4154693.html?utm_source=healthia&utm_campaign=health-2021-12-24&utm_medium=email

https://www.drweil.com/blog/health-tips/breathing-to-help-manage-holiday-stress/?utm_medium=email&utm_campaign=Daily%20Tip%2011252021&utm_content=Daily%20Tip%2011252021%20CID_359878d166ccc1dafe8a5206a77b471b&utm_source=Email&utm_term=A%20Breathing%20Exercise%20To%20Relieve%20Stress