Health related fitness relates to an individual who is health conscious especially the way they look , feel .They ensure that they don't contract terminal illnesses and diseases so they exercise regularly but not as much as a person who does it for their career examples include athletes and football players who have to always keep fit and have good balance and a good diet to ensure they can perform well and to their full potential.
That is something that cant be explained you will have to go to a doctor or a medical person or physician for that . or try avoid using a cold shower take a hot shower