If you have faith. If you believe. If you understand. That there is a spiritual world that exist and the good side of that world is with GOD. We are human tangible beings. We have five senses that make up our physical self. The mind body and soul work together. And that each rely on the other in having a sense of well being. God made us in his image. That is not to say we are made perfectly. Image means the external form. The internal mechanisms, the spirit, our brain are used to keep us alive. If there are parts of this human schematic that is missing or comes up short we are lost, sick, incapacitated. Through medicine, prayer, exercise it is possible to keep ourselves healthy. God sent Jesus to help us know what is expected of us spiritually. The doctor tells us what is expected of us to keep our bodies in good order. Challenging the brain keeps it healthy as well. Know God. Have faith in him and only him.
2 Peter 1:2 May grace and peace be multiplied to you in the knowledge of God and of Jesus our Lord.