Every study I have seen either requires a longer duration of 20-30 minutes or a set of very intense but short intervals for the same effect. The protocol in thi

Every study I have seen either requires a longer duration of 20-30 minutes or a set of very intense but short intervals for the same effect. The protocol in this study treated the walking as an exercise routine with a warmup and cooldown period. They only used 70-80 year olds in this particular study so one likely has to rely on overviews like this https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5440589/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5440589/ since a longitudinal study with as much data gathering as this UMD study might be kind of expensive and intrusive on study participants. You either should exercise because you want to or not, I don't think any single study is going to convince anyone if they do not want to. Based on my rudimentary understanding of physiology and aging, one would want to because one's ability to exercise steadily declines after about age 35 unless one exercises regularly.