Table 3 Summary of feedback and amendments resulting from retrospective interviews

Some voiced opinion that they felt physical activity content wasn’t relevant to them as they perceived themselves to already be physically active (despite not meeting exclusion criteria for existing high levels of physical activity)

“For me, it was the actual activities, the actual physical bits, weren't terribly challenging.” (P0146)

Additional messages added in to introductory and early physical activity content to emphasise that even those who are already active can use content to help them increase activity, and to stress importance of continuing with/ increasing activities they already do and enjoy. Additional signposting to aspects of content where users have more free choice about the level of challenge of their activities—e.g. writing their own goals, resources for finding activity classes/groups in their local area, and setting their own strength and conditioning exercise plan,

A few suggestions that it would be useful to have more explicit suggestions about ways to stay motivated with making behavioural changes—particularly about how to use social support to do so

“The one thing I think you could do a bit on is finding the incentive to do all these things, so that we've got to do them to keep going, but you tend to put them off because you're doing other things at the time.” (P0265)

Extra pages added to give examples of motivational strategies, including ways to involve others (e.g. weekly step-count competition with friends/family) and activities to boost motivation (e.g. ‘Reasons to be Active’ card).

Some perceived healthy eating content to be largely in line with what they were already doing. Furthermore, expert advice from within the team recommended placing greater emphasis on the ‘foods for brain health’ as novel/interesting element.

“I read it through with interest and I thought: Oh, well, I do that; I eat that. I agree with all of that and that's what I do; but there was nothing in there that I felt that I didn't already do.” (P0250)

Restructure of the healthy eating content so that the initial information and goal setting centres around specific foods beneficial for cognitive health, with additional more general healthy eating advice presented after this.