Does Exercise Boost Immunity?

I love the New York Times - their articles on health and fitness are second to none.  I've just read this really interesting article on reasearch done into exercise and the immune system. 

For many long distance runners, footballers and rugby players autumn heralds the start of training for the season ahead.  This coincides with an increase in seasonal flu which strikes horror into the heart of any athlete. 

Find out how you can keep healthy here.

Do you think exercising has an impact on your immune system? Leave a comment - go on!