SPIRIT Club Chronic Brain Injury Exercise Platform

Feasibility will be assessed over the intervention period using recruitment rate (number of enrolled participants relative to those approached) as an objective indicator.

Feasibility will be assessed over the intervention period using attendance (number of sessions completed) as an objective indicator.

Feasibility will be assessed over the intervention period using attrition rate (proportion withdrawing before end of the intervention period as an objective indicator.

Feasibility will be assessed over the intervention period using unplanned study-team contacts (number of emails and/or calls outside scheduled check-ins; total and per participant) as an objective indicator.

Feasibility will be assessed over the intervention period using accessibility issues (number of instances where participants could not successfully acquire or use the streaming platform or data-collection tools; participant and/or staff team reported) as an objective indicator.

Safety will be assessed through the documentation of exercise-related adverse events (number per participant and total over the intervention period).

Acceptability will be evaluated immediately after the 8-week program or at the time of withdrawal using an electronically administered survey. The investigators will assess acceptability based on answers to a 5-point satisfaction scale (1 = very dissatisfied to 5 = very satisfied) for (1) overall program content and (2) usability and a series of binary yes/no responses to the following questions: "Was the program worth the participant's time?" and "Would the participant recommend it to others with CBI?"; and open-ended comments capturing likes, dislikes, and improvement suggestions.

Electronic survey administered to participant. Change in total score on the validated 6-item exercise self-efficacy scale, from baseline to Week 8, which assesses participants' confidence to engage in physical activity despite common barriers.

Activity is monitored using a Fitbit Inspire 3 wearable device, which captures daily step count.

This outcome provides a comprehensive assessment of participants' physical activity patterns by a Fitbit Inspire 3 wearable device, which captures active minutes in intensity zones.

Utilization metrics will be drawn from the SPIRIT Club streaming platform's automatic logs on a weekly basis (Weeks 1-8), including total number of classes initiated These data quantify how frequently and intensively participants engage with the CBI Pathway.

Utilization metrics will be drawn from the SPIRIT Club streaming platform's automatic logs on a weekly basis (Weeks 1-8), including cumulative minutes of video streamed (group total and per participant).

The total number of activities completed each day, as measured by a participant-completed daily activity log.

The total duration of activity in minutes each day, as measured by a participant-completed daily activity log.

Electronic survey administered to participant. Change in total score on the validated 8-item questionnaire, from baseline to Week 8, that assesses the extent to which an individual engages in a health-promoting lifestyle, specifically with physical activity. For each item, participants rate how often they engage in the described behavior on a 4-point scale (1=Never, 2=Sometimes, 3=Often, 4=Routinely). Total scores are calculated by summing the responses, with higher scores indicating a more health-promoting lifestyle.