The outcomes for this feasibility trial are:

Referral rate recorded as the number of young people referred for screening via any route by the end of recruitment

Recruitment rate recorded as the number of eligible participants who consent to participate in the study by the end of recruitment

Attrition rate recorded as the number of participants who consent to participate that do not remain in the study until the end of follow-up at 26 weeks post randomisation

Attendance rate at the intervention sessions as a proportion of the total number of sessions by 12 weeks

Heart rate as measured using a heart rate monitor at each exercise session up to 12 weeks

Physical activity measured using an accelerometer as proportion of time active at baseline, 14 weeks, and 26 weeks

Adherence to the intervention protocol as captured by the intervention logs and rated against the adherence checklist by members of the study team at weekly intervention sessions and at 14 and 26 weeks

Proportion of missing data will be reported as the percentage of recorded outcomes against those expected after account for withdrawal for each outcome separately at 26 weeks

Adverse event rate recorded as the frequency, type (injury or clinical progression of depression), and severity of event by treatment arm at 26 weeks

Estimate of resource use as measured through observation and study-specific questionnaire at 26 weeks

Reach and representativeness measured by the proportions of young people who are screened for participation and are randomised in comparison to the characteristics of local populations by the end of recruitment

A traffic-light system, relating to recruitment, retention, adherence, and completion will inform whether we “stop”, “proceed”, or “proceed but with protocol changes” [64]. This system will be judged on criteria including young people’s attendance at sessions > 66% and questionnaire completion > 80% at 14 weeks. Additional process evaluation outcomes are the acceptability of the interventions and questionnaires, barriers and facilitators to engagement of young people, evaluating recruitment methods, and adherence to the intervention protocol by deliverers (fidelity).

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