John should make sure of the bear basics of health. This includes elementary principles, such as: Washing your hands frequently, being able to provide enough food and water in order to nourish his body, whatever prescriptions, vitamins, or medicine neccesary to his personal needs, an average amount of exercise, etc.
About percent of adults experience low back pain at some point in their lifetime. It is the most common cause of job related disability and a leading contributor to missed work days.