Mind and Body - Separate things?
I like to look at a person as a whole system, just like an aircraft is made-up of a fuselage, engine, aircrew, controls, and wings. Have a look here at a speech I gave recently. I look at the Mind and the Body as the two main components of us people. There are lots of other ways to break us down into more details, but it is sometimes useful to look at the big picture. The Mind - Body - Spirit approach is a simple but complete way to look at yourself.
Our Mind is usually regarded as what is stored in our head with neuronal connections and chemical interactions. Taken at the highest level, it includes what we think about consciously but also unconsciously emotions, senses, nervous system, and biological processes to control some of our vital body functions without us having to think about it (I wouldn't want my heart to stop when I fall asleep!). The mind may also include a certain spiritual aspect of our thinking.
This one is easy: our physical us is mostly what's not coded into your head, although your head and your physical brain are part of your body. That is the simplest way to divide humans and it's used this way quite a lot. Our body is what allows us to move around and actually touch things and interact with people. It allows us to communicate, eat and reproduce.
This generally represents something larger and more encompassing that just your internal mind in your head or your body. Of course that is the case with religious faith, but many people also think of the spiritual aspect of their lives as a higher purpose regarding with how they are linked to others, a greater good, or aspirations in some not necessarily scientifically understood manner. It used to be that the spiritual aspect was impossible to measure in a scientific manner, but breakthrough in brain imaging and positive psychology has come up with new scientific evidence clearly indicating there are benefits of thinking like this and that it is definitely good for you and will likely make you feel happier and more positive.
The interaction between the body and the mind
This interaction is constant between our three essential components (Mind-Body-Spirit). My mind thinks, and allows me to have ideas and concept to communicate to people, while my body translate these thought into actions, something that can be communicated. It is important to keep this team working together: your mind must look after your body, or else the body will become weak. If your body weakens, your mind will lack energy to process information and direct actions properly, which will make the body even weaker.