Swine flu hysteria is all around us. Want to boost your immune system so you have a better chance to fight infection? Try regular — but not too drastic — exercise. Believe it or not, studies have hinted that people who are physically active on a day-to-day basis suffer from fewer colds and flu, and less severe infections, than those who are inactive.
In a new animal study, researchers divided mice into two groups: those who regularly ran on a treadmill over a 3.5-month period, and those who d...