I think there's room for
negligence against one's own safety in the 5th Commandment. I found
this article which made some sense:
This also holds for gang fighting and "chicken" car chases or racing when one puts their life in danger. The same holds true for daredevil stunts and dangerous antics such as skydiving or bungee jumping without proper instruction and strict safety precautions. Teens and young adults are more prone to these stunts because they have more of a sense of "invincibility" and often, only age and the wisdom of their faith can mellow their thinking.
Very often the condition of the body affects that of the soul. If the body is unhealthy, the soul suffers. There is a wise Roman proverb: "A healthy mind in a healthy body." However, we are not obliged to employ unusual means involving great expense, or extraordinary suffering. We must exercise prudence in preserving our health and that of those under our care. Prudence would imply cleanliness, temperance, regularity, industry, and the use of remedies during sickness.
Driving a car at excessive speed, crossing the tracks when a train is approaching, playing with loaded firearms, jumping into or out of a car when it is in motion, any kind of action that would endanger one's life are imprudent actions, taking risks for insufficient reason.
It goes on, to nearly Puritanical-type values (no drinking, etc), but I think you can pilot, bungee jump, etc for a thrill as an activity with a very reasonable expectation of living IF YOU KNOW WHAT YOU'RE DOING ("proper instruction" and "strict safety precautions"). Otherwise merely stepping in a river
might get you swooshed out to sea, and we'd all still be in Africa or the Middle East somewhere, scared to step away from safety.
Nascar, I know nothing about, but they've got to make money, and there are lots of crashes that don't kill people, so I'd suggest those drivers both have knowledge and safety equipment AND sufficient reason (to earn a living) in driving fast. But I know nothing of Nascar.
I'm not sure how skydiving would be bad if you've taken the lessons, either.