A randomised controlled trial has assessed the effect on quality of life of digital self-guided breathing retraining exercises for people with asthma.1 The trial included 655 patients aged 16-70 years recruited from 34 UK general practices. Eligibility criteria included asthma diagnosed by a physician, prescription of at least one asthma medication in the previous year, and impaired asthma-related quality of life (Asthma Quality of Life Questionnaire [AQLQ] score of <5.5). The self-guided …