The hardest thing to overcome with exercise research is the lack of a placebo control. i like that they showed dcreases in inflammatory markers in this study.

I worked in a psych hospital for a few years in the early 1990s, on a locked unit. It was a private hospital and about as nice as one could hope for. So it wasn't an underfunded state hospital. In retrospect, I just realized that they had zero opportunities for patients to exercise. There was a courtyard for getting fresh air, but it was too small to do any walking. So not only were there no opportunities (any kind of a gym, place for walking/running), the unit did not even physically allow for exercise in those who would want to.