Stay home and stay safe until outside conditions improve.
It would be Alcohol, any drug use,eating unhealthy, smoking,lack of working out, lol basically having intercourse at a young age without any protection, also unintentional injuries or violence.
P.s to prevent most of these all you need to know is right and wrong and if you know these thing can have consequences then don't do them also keep your legs closed , for one of them its important to work out every now and then
Exercising regularly can help you in many things like flexibility speed body strength tolerance to running or exercising a certain amount of time
EXAMPLE:if you join gymnastics doing flips and tossing and turning flipping and running all day can increase flexibility because to do certain stunts your body needs to have a certain level of flexibility like doing back bends if you do not have the stage of flexibility that it requires you will not be capable of doing it