This should be especially confusing to HN readers because it wasn&#x27;t just a few weeks ago that a similar article was  posted on HN which reported that only prolonged exercise would have any positive effects on improving cognition, with HIIT purportedly having very minor effects on cognition.<p>I assume that though many of us exercise for the health effects, many do so specifically for the benefits that exercise can have on our brains. Now after reading this study--well, it seems our entire understanding of the subject is inconclusive.