Physical fitness would be the answer. In order for you to walk, you have to be well enough to walk, For instance, you need to be in shape to walk. Some people are so overweight that that they need a wheel chair just to get around and are an extreme example of what it is not to be physically fit. Regular exercise should help you avoid this predicament.
Well infectious diseases are caused by pathogens that enter our body by physical contact, insect bite or air.
A Noninfectious disease are caused by genetic factors and lifestyle factors. Diabetes, hypertension, coronary hear disease etc.
I hope this helps.
The resulting Pittman-Robertson (P-R) Act, passed in 1937, is now known as Federal Aid in Wildlife Restoration
If you aren't checking yourself then you may have a problem. For example you could have testicular cancer and you wouldn't know without feeling an unusual bump in that area.