Strengths and limitations
RECRUITMENT
The strengths of this study include, first, answering the call for a more holistic approach to trial evaluations [Despite these strengths, there are limitations to be considered. First, there is a potential for recruitment bias, because only people who were interested in becoming more physically active took part in the trial, thus leaving it unknown how the intervention would have been implemented with a less motivated sample. Second, the variability of the intervention dose does not allow general conclusions regarding the content and adaptation of the intervention. However, examining only selected participants would not correspond to practice. Therefore, the subgroup analysis was deemed a suitable solution to evaluate the intervention implementation concisely while preserving variability. Third, there are some limitations in the quantitative data. For example, it cannot be gauged why the early dropouts had shorter in-person counseling sessions, why some people preferred longer intervals during the remote counseling sessions or why coaches used some BCTs more frequently than others.