They already do .. badly. There was an excellent thread on twitter the other day along the lines of "I went to my doctor saying I was suicidal and got sent away with this worksheet" - a whole collection of completely inadequate responses to acute mental health issues.

That would be the "fuck if I can help you" non-response. Around here it happens a lot because it takes so long to get into a psychiatrist that unless you admit to suicidal ideation, intent and a plan, you're not going to get help fast. A lot of family docs have their hands tied.

In practice, it probably just adds a bit more motivation or reinforcement to the existing body of knowledge. There is a lot of conflicting info out there about how much is needed, what kind, etc., so the fact that this is saying a broad range of activities and so on were shown helpful is a plus. Helps take the "should I run or bike or weight lift or... screw it, I'm sitting on the couch" out of it.