Table 4. Fitness and nutrition app acceptance investigated by the qualitative study by Cabrita et al. [55].

Theme	Subtheme(s)			Specifications
app usage	fitness app			no current usage
	nutrition app			no current usage
				no future usage (no need, self-perceived high activity level (n = 2))
attitudes towards app (pre usage)	fitness app	interest / desirability	barriers / reluctance to usage
			general	to the beginning of the interview: overall reluctance / rejection (n = 12) during the course of the interview: hypothetical usage (“maybe”) (n = 6), still rejecting (n = 6)
			perceived usefulness	no benefit seen, preference to rely on own bodily feelings to assess activity level (n = 5)
			expected behavior change	usage leads to decreased attention to body signals (n = 1)
			privacy concerns	none mentioned
	nutrition app	interest / desirability	barriers / reluctance to usage
			general	vague, hypothetical interest after specific suggestions by interviewers (“maybe that could be something” answered) (n = “mostly answered”)
			perceived usefulness	self-monitoring dietary practices established, no need of technological support (n = “some participants”) digital monitoring too time-consuming (n = “others”) preference to talk to someone (n = 1)
			privacy concerns	none mentioned
wishes and expectations towards apps	fitness app	wishes and expectations	monitoring functions	overview daily physical activity regarding intensity, number of steps (n = 6) overview daily distance walked and biked (n = 2) overview calories burnt (n = 2) distinction between activities performed indoors/outdoors (n = 1)
			motivating features	personalized coaching of daily physical activity goals, tailored to health status, age and gender (n = 3) setting of own activity goals (n = 1) gamified coaching system, e.g., collecting points (n = 1)
			social exchange features	comparison to activity of peers (“most participants”)
		expectations	positive	expected behavioral adaptation according to feedback (n = “most participants”)
			negative	distraction by digital monitoring (“attention theft”) (n = 1) overview of time spent inactive too confronting (n = 1)
	nutrition app	wishes	monitoring functions	caloric and /or nutritional intake (n = 4)
			motivating features	healthy recipes tailored to medical background and needs (n = 4)
			social exchange features	sharing of nutritional knowledge with peers (n = 1)

Note: Themes, subthemes and specifications presented here are a result of the review synthesis process resp. thematic analysis, i.e., this table depicts an abstraction resp. deduction of the primary study [55] results and only involves study results addressing the review questions.