This study will explore the feasibility, acceptability, and potential benefits of a group-based tailored yoga programme designed for adults experiencing symptoms of attention-deficit hyperactivity disorder. The yoga intervention will be compared to an active control (group-based functional movement classes).

The primary aim of the study is to test the feasibility and acceptability of a tailored, group-based yoga intervention for adults with attention-deficit hyperactivity disorder, by monitoring recruitment, engagement, and completion rates, and through obtaining qualitative feedback from participants at the end of the intervention.

A secondary aim is to explore whether the yoga intervention is associated with improvements in attention-deficit hyperactivity disorder and related symptoms (i.e., anxiety, depression), quality of life, and general functioning, compared to a control intervention (group-based functional movement sessions). The secondary outcomes will be assessed with self-report questionnaires at the start, middle and end of the yoga and control interventions, and three months after completion of the interventions.

The investigators will also examine aspects of cognitive and physiological functioning through laboratory testing at the start and end of the intervention, focusing on measures of autonomic activation (e.g., the 'fight or flight response), bodily awareness, attention, and response inhibition. Physiological functioning, such as sleep quality, activity levels, and heart rate, will be monitored throughout the six-week study with wearable devices (e.g., Fitbit activity trackers), to provide longer-term, real-world insights into the possible benefits of the intervention.

The investigators will explore whether the yoga intervention is associated with improvements in attention-deficit hyperactivity disorder and related symptoms/abilities, including emotional regulation, social behaviour, attention, focus, interoception and stress reactivity. The investigators will also explore whether the yoga intervention is linked with improved bodily stress markers (heart rate variability), sleep, and physical activity.

This feasibility randomised controlled trial will include 20 participants who will be randomly allocated (1:1) to either the group-based tailored yoga therapy intervention (n=10), or a group-based functional movement class (n=10). The latter will be a structured class focusing on light strength, mobility and flexibility.

All participants will attend an initial in-person laboratory testing session at the start and end of the 6-week intervention. Each week, both intervention group and control group will attend an in-person one-hour group session. Each week, participants will be asked to practice at least twice, using a 20-minute video recording on demand from home. Outcomes will be measured using self-report, lab-based, and digital wearable measures.

Inclusion Criteria:

• Are aged 18 or older.
• Score above the clinical cut-off threshold on the Adult Attention-Deficit Hyperactivity Disorder (ADHD) Self-Report Scale.
• Are fluent in English.
• Have normal or corrected eyesight.

Exclusion Criteria:

• Major physical health disorders or disabilities that may affect participation (e.g., uncontrolled epilepsy, significant mobility challenges).
• Major mental health disorders that may affect participation (e.g., active psychosis, severe alcohol/substance use disorder).
• Current recipient of any other mind-body therapy for attention-deficit hyperactivity disorder.
• Current participation in a regular yoga activity.
• Current pregnancy.