Exercising during the cold and flu season will help people stay in shape, and most likely fight off colds or reduce the number of days a person is ill. The cold season should not be an excuse for the average person to refrain from exercising - working out at the gym, a brisk walk in the park or a jog through the neighborhood.
There is still a lot to learn about how exercise affects the immune system, because it's difficult for researchers to assess the many layers of protection within the system. Strenuous or prolonged exercise seems to suppress the immune system, leaving athletes more susceptible to illness for one to six hours following a hard workout - the so-called open window.
The soul is the form of the body, but not as the shape of a statue is formatio et terminatio materiae, for form does not exist apart from material. There is no whiteness without a white object. But the soul is not a form in this simple sense, and in particular, is not the shape of the material it informs. Therefore, the shape of a being does not affect the being's soul, for then something lower would inform something higher, which is impossible.