For those of you with better understanding, did they establish causality? Does exercise fend of mental disorders, or do people with mental disorders find it harder to exercise consistently? The first could be a novel finding, but the latter seems obvious. Forcing yourself to exercise routinely requires discipline, and many mental disorders carry along with them executive dysfunction that make discipline harder to come by.
Experientally, my brother with ADHD and severe depression, has told me many times, that he notices a huge difference in the severity of his depression based on how much he exercises.
