“…One potential way to achieve this are different types of digital wellness technologies, such as smartphone and smartwatch applications, which have been found very promising in terms of promoting the levels of physical activity not only among young but also among elderly people (e.g., Changizi & Kaveh, 2017;Muellmann et al, 2018;Elavsky, Knapova, Klocek & Smahel, 2019;Stockwell et al, 2019;Yerrakalva, Yerrakalva, Hajna & Griffin, 2019), although more high-quality studies especially on their longterm effects are still called for. In addition to elderly people in general, their potential has also been highlighted in the more specific segment of young elderly, which consists of people aged approximately 60-75 years (e.g., Carlsson & Walden, 2015Walden & Sell, 2017;.…”