The SFL intervention included physical and cognitive training activities. The physical exercises (Exercise) focused on strength, balance, and mobility with various difficulty levels [20]. Cognitive training included activities for divided attention [21], problem solving [22, 23], and memory [24]. To increase adherence and social interactions, participants had access to a moderated Chat Room, the possibility to create material for the activities, psycho-educational content, and gamification elements (e.g., rewards, leaderboards). A customizable virtual guide provided participants with instructions, reminders, and feedback. Participants were asked to engage in physical exercise at least 3 days per week for 30–45 min and cognitive exercise for at least three 15-min sessions per week.
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