Completeness of data
Of the 18 participants who completed the follow-up assessment, all provided physical function, cognitive function, and health, wellbeing and psychological outcome data across all tests. Sixteen of the 18 participants returned their exercise snacking logbooks, which showed a reported adherence rate of 80% of all exercise snacks completed across the whole group. One participant elected to discontinue the exercise snacking intervention after one week but attended the follow-up assessment and the follow-up interview. Of the 15 participants who attempted 28 days of the intervention, reported adherence was 85%. Half of participants who returned their logbooks completed all exercise snacking sessions over the 28 days. Three accelerometers that were distributed at baseline (n = 21) were misplaced by participants and not returned to the research team, and a further three provided no data owing to technical faults with the device (n = 2) or were removed by the participant. Of the remaining 15 accelerometers, 11 returned complete seven days of valid data, and four had partially complete data (three with six days, and one with three days due to battery fault).