My many psychological issues, including bad, long lasting depression and generalized anxiety, have all been connected to physical states. It is also the case that psychedelics somehow take me into the body where I get to witness things being changed -the higher the dose, the deeper I go, no visuals, no elves, none of that. Over the years, this process of transformation altered my mental states significantly, and the link between the body and the mind is very transparent indeed.
Some famous person said that you can;t solve an issue at the level of complexity at which it arises (or something like that), and I find that to be the case in that one way to approach psychological difficulties is to focus on how they are mirrored by physical states, then act on the body to heal the mind.