Well. You might have already thought of this but you can eat healthy foods like greens. And you can also exercise like stretching or going out for a 30 minutes run every day. These two thing do help your emun system witch fights off diseases. Also helpes you not get them as easaly
They would be able to easily access your organs, give you an infection, make you sick, or kill you depending on the type of germs.
One thing you could do in order to measure your cardiovascular strength, you can do a full sprint. In order to improve this you can swim, jog, run, body weight exercised, and a balance diet.
