Auto racing - With tons of metal wrapped around you, and going an average of 150 mph (280 km/h) on hard asphalt, chances of a lethal accident are high.
Skiing - Skiing requires both athleticism and finesse to master the right techniques. But regardless of skill, the risk of injury is very real.
Big wave surfing - Overall, big wave surfing isn't that deadly. But if you're knocked off the board after riding a big wave, you could be knocked unconscious.
Snowboarding - A combination of surfing and skiing, snowboarding injuries can have dangerous consequences.
Downhill mountain biking - Riding down a steep and narrow mountain trail may seem like fun. But it often ends with major fractures, head injuries, internal bleeding, or even worse.
Cliff diving - This extreme sport involves diving into water from a high, rocky cliff. The typical distance is about 85 feet (25 m), so injuries are definitely possible.
Boxing - It's no surprise that boxing isn't an injury-free sport. With the main goal of punching the opponent, boxing can have many long-term consequences, such as CTE.
Motorcycle racing - If car racing is dangerous, then imagine motorcycle racing, where the rider isn’t protected by a sturdy cage in case of an accident.
Mixed martial arts (MMA) - A competition between two highly-skilled fighters, MMA can be very dangerous. Especially as the main objective is to knock the opponent out.
Ice hockey - Hockey is an injury-prone sport. Some of the most common injuries include fractures, broken bones, facial cuts, and head injuries, including concussions.