Exercise will boost your immune system. Being active helps your body to stay active. When your body is alert and energized, it will be able to stay strong and fight off unwanted germs and bacteria which will help prevent getting sickness such as your common cold.
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Discovery Health answered
Overall, yes. Exercise leads to an increased production of antibodies and T-cells, both of which help the immune system by hunting down and killing antigens. Exercise also increases happiness, and studies show that happy people are more resistant to illness. But don't overdo it: Intense exercise actually weakens the immune system in the recovery period after such exertion, leaving you susceptible to germs.
Exercise can help boost your immune system and keep sickness at bay. People who exercise tend to have fewer colds and other respiratory infections than people who aren't active.
Always check with your doctor before beginning a new exercise program.