The researchers asked healthy volunteers to keep a record of any coughs and sniffles they experienced over a three-month period during fall and winter. The volunteers who were physically active on five or more days of the week had colds that lasted a total of 5 days out of the 3-month period, while the control group, who did little or no exercise during the same period, were affected by colds and sniffles for nine days.
As a side benefit, the exercisers who did get a cold cut the severity of the symptoms by 31%.
Finally, if you do get a cold, continuing to exercise even at lower level of intensity and time can make you feel better.
So…just put one foot in front of the other and keep exercising.