Methods: Participants were recruited from 7 British prisons and randomly allocated to either a 10-week
yoga programme (yoga group; 1 class per week; N ¼ 45) or a control group (N ¼ 55). Self-report
measures of mood, stress, and psychological distress were collected before and after the intervention
period. Participants completed a cognitive-behavioural task (Go/No-Go) at the end of the study, which
assessed behavioural response inhibition and sustained attention.