I wonder myself, hence the thread. How do people distinguish between "spiritual" and psychological?
I believe that there is a distinction between the body, the mind, and the spirit.
The body provides us with instinctive urges, such as hormonal drives, the reptile brain, etc.
The mind provides us with thought and reason, such as cognition, logic, deduction.
The spirit provides us with life, such as the motivations that compel us and the will to be who we are.
There really isn't any scientific evidence for this approach, but it is an approach that has been accepted and understood by cultures around the world for thousands of years. This isn't a perspective that is isolated to one particular school of thought, religion, philosophy, etc. In fact, the philosophy of science is one of the few schools of thought that doesn't include some take on this perspective, however science is an excellent school of thought and therefore one of the most widely accepted.
We have come a long way with science over the years.
Science understands the body on an amazing level because humanity poured massive amounts of resources into understanding it. Understanding the body had the priority. Without the body, we cannot exist in this world.
Science is beginning to unlock the mysteries of the mind because humanity is beginning to shift its focus to the operations of the mind. As understanding of the body becomes stable, it is now time to focus on the mind, that which operates the body.
Just as the more deeply science understood the body the more it unlocked understanding of the mind, the more deeply science understands the mind, the more science will unlock understanding of the spirit. However, just as we lacked the tools to properly measure the mind a hundred years ago, we currently lack the tools to measure the spirit.
That all said, it is possible to affect change in the body by working out, dieting, practicing a physical skill. It is possible to affect change in the mind by gaining knowledge, challenging one's mental capacities, and practicing a mental skill. Therefore, it is possible to affect change in the spirit by engaging one's spirit, feeding it, and using it. How to do this depends on the individual's current spiritual state and spiritual intentions. Just as with the body, you have to tailor your efforts to your desired results.