Our 4 "quadrants of life", the spiritual, mental, emotional and physical, function as one permeating and co-operative scheme. These quadrants differ in vibration level, and most individuals may only realize the physical. What bears on one-quadrant effects the others, and being cognizant of how this occurs will help a good deal in accomplishing a wholesome balance. On the physical level, viruses and microbes are still not the true cause, but the deficiency of suitable nutrition and exercise that enables our bodies to be resistant to them. Viruses and microbes are in and around us day in and day out, even in healthy individuals.
So how do we better treat this composite and intricate holistic system (body) in which we live? It apparently calls for more than a quick crash program. You're likely already doing a lot of things to help. The fact that you're reading this means that you're taking steps in being responsible for your own health and not forever waiting for something to go wrong and then expecting your physician to "repair" you. This isn't to say that you shouldn't see a physician when you're not well. They supply a critical and merciful service most of the time, and attempting to do altogether without them may be a calamitous error. That being stated, much of "modernistic" Western medicine doesn't take a holistic approach to wellness but centers on symptomatic alleviation. To balance physical fitness with all the additional matters we have going in our lives, a lot of us favor getting away with the minimal possible to keep healthy. That sum may really be quite a bit less than many might think. But a nonchalant walk isn't going to do it.