It would stand to reason that every student who completes high school would have a lifetime fitness plan. Something that works toward good health. Learn a workout routine that is appropriate for your body. Talk to professionals who can teach you a regime that will keep you physically fir for the rest of your life. A nice benefit when your body is strong is that you do not get sick as often, or, as badly.
Healthy people can do more things to improve their state of being.
Do not allow yourself to get to a state where a small amount of exertion can cause you to tire out or get you jittery. Work on your voice. Moderate your tone. Try to make it clean and clear. Don't speak too fast or too slow.