Yesterday I advised somebody that physical activity is highly beneficial for mental health and can help more than medications would alone. The community did not like that. I am here again to remind you that physical activity is Paramount to mental well-being. Go out and garden. Take a walk in the park. Go for a jog, whatever it may be that gets you out of your current location and allows you to reflect and think.
Personally I think it should be viewed from a heirarchy of needs. Exercise is a basic need like other food security, physical safety, sexual safety.
I think satisfying basic needs is a necessary, but not sufficient condition for mental health.