Answer:
don't smoke,eat healthy food, decrease the salt in your diet, maintain a healthy weight, increase physical activity, manage stress
By slowly introducing the changes and not implementing them all at once.
Answer:
I personally think they should reduce it from 6 feet to 3 feet because: Normally we stay 6 feet apart in case someone sneezes or coughs,(In schools also, not just in public), but there is no need to stay that far away; 3 to 4 feet is enough. Plus, in schools, friends want to socialize more, but that is not easily done when you are 6 feet apart. And, you do get tested a lot if you go to school, so if someone has virus symtoms, they probly will stay home and not go to school.
Hope this helps, and have a good day.