severely reduce immune function," says immunology specialist Dr Laura Stewart. "One of the best ways to reduce the risk of upper respiratory tract infections is to be sure you aren't overtraining. Moderate exercise reduces this risk, but speedwork, long
attention to the details of staying fit, focused, and balanced. You have the most to lose, but also the most to gain. So make sure you gain every advantage you can. Boost your fitness Don't overtrain Your body will tell you when you're training too much – a
