We’ve known for a long time that regular exercise and keeping physically fit is good for your body. It helps to reduce the chances of suffering from illnesses such as heart disease and diabetes, increases your metabolism, and boosts your immune system. But working out does more for your body in terms of fighting off sickness than many people realize. Sure, we know it keeps our heart, lungs, and body healthy in general, but did you know that it can actually help to fight off o