Table 2.

Definitions, methods, and targets of the feasibility and acceptability measures.

Outcome category, measure name		Method of measurement	Measure definition	Target
Feasibility
	Recruitment rate	Recruitment data	The ratio of retained participants to interested individuals	>25%
	Recruitment of racial and ethnic minority individualsa	Recruitment data	The percentage of retained participants who were racial and ethnic minority individuals	>50%
	Retention rate	Surveys, Fitbit data	The ratio of retained participants to randomized participants	>80%
	Fitbit valid wear	Fitbit data	The percentage of participants with at least 80% of study days with valid Fitbit data	>80%
	Behavior change technique video adherence	Views of behavior change technique videos	The percentage of participants who watched at least 4 behavior change technique videos	100%
	Group support engagement	Chat logs from the group support group chat	The percentage of participants who chatted at least half (50%) of the study days	>80%
	Exercise snack video usage	Views of exercise snack videos	The percentage of participants who watched at least 4 exercise snack videos	100%
	Behavior tracking response rate	Message replies	The ratio of the replied messages to the sum of all the sent tracking messages	>90%
Acceptability
	Qualitative acceptability	Semistructured interviews with participants	Interviews with participants at the end of the study asking about their experience with the intervention	N/Ab
	Quantitative acceptability	Surveys	Survey questions asking about the acceptability of various study components on a 5-point Likert scale	>70% for all study components

^aAn individual who identified as African American, American Indian or Alaska Native, Chinese, Filipino, Indian, Japanese, Korean, Latinx or Hispanic, Pacific Islander or Native Hawaiian, Vietnamese, Other Asian, or other.

^bN/A: not applicable.