Maintaining or strengthening lung health and your immune system are key components to fighting viruses, especially ones that affect the respiratory system. With the constant threat of unseen respiratory viruses like COVID-19, we need to have a way to protect ourselves from illness. Though we can’t control what happens outside our home, there are steps we can take to improve our lung capacity, simultaneously boost our immune system, and ensure that the air INSIDE our homes is healthy.  First, let’s take an abbreviated look at how the lungs and immune system work together.