Simplifying the Complexity of the Effects of Exercise on Immune System Function

When experts talk about immune health, they are referring to the ability of your immune system to recognize a pathogen, like a bacteria or virus that attacks different cells and systems; build the antibodies; and effectively kill or neutralize the bacteria or virus. 

Original source: https://www.afpafitness.com/blog/simplifying-the-complexity-of-the-effects-of-exercise-on-immune-system-function