We all know exercise is, overall, good for health. But to get the benefits we must fuel correctly, which includes fuelling to support the immune system. Exercise puts a stress on the body and if the nutrients we need to support the immune system and exercise are in limited supply, both short term and chronic intense training sessions can result in immuno-compromise and increased inflammation. It is why elite athletes can be more susceptible to infection and illness. Inadequate sleep and stress also play a critical role in suppressing the immune system.