10. White-Water Raftingbr br White water rafting is a perilous outdoor activity in which an inflatable raft is used as a vehicle to navigate white water or other water bodies of rough water. The environment is varied, and brings new challenges to the participants. The wild waters pose the threats of tossing the participants, smashing them into rocks. The foot entrapment can entangle a participant if he falls off, making it difficult for him to dislodge himself easily. Common injuries include broken bones or twisted knees.br br 9. BMXbr br Bicycle motocross, or BMX, is a cycle sport, and there are special kinds of bikes, known as BMX bikes, which are ridden in this sport. While the sport in its basic form involves racing, its offshoots include bicycle stunts on vertical ramp and flatland. It requires the cyclist to perform a combination of acrobatics while he is astride the BMX bike. As the bikers strive to do a trick no one else has ever done before, they are likely to face injuries or even concussions, besides cuts, scrapes and bruises.br br 8. Mountain Climbingbr br It is not too hard to comprehend that mountain climbing essentially involves the risky activity of climbing up and down the highest of natural rocks, i.e.mountains. Every element of this activity is risky. The climber can receive different physical injuries like twisted ankles, sprained muscles, torn ligaments, broken bones, back injury, concussion, or frostbite, during the heavy physical activities or from falls. Weather changes can be lethal, one can lose path easily, and deaths are quite common.br br 7. Street Lugebr br Street luge is a lot like skateboarding, except the rider is in a supine position on the luge board or sled, as he dashes down a paved road or course at extremely high speed. The legality of this extreme gravity-powered activity is a shady issue. Participants are required to put on protective leathers and helmets, or the chances of getting smashed by vehicles that will most likely not notice the riders, will go higher. The chances of collision on road are high, short of which, only the feet work as brakes.br br 6. Big-Wave Surfingbr br Big wave surfing is a discipline of surfing in which surfing maestros paddle into or are towed onto waves of the height of at least 20 feet. The most coveted crown is to ride an intimidating 100-foot wave which offers a prize a $100,000. Some of the biggest hazards of this sport include drowning and being pulled into the water by the current, or even have the head smashed against the hidden underwater rocks. It is also not impossible to get whacked by the gun, which is the surfing board.br br 5. Bull Ridingbr br Bull riding is a rodeo sport, in which the rider mounts a large bull and tries to stay atop the bull, while it attempts to buck off the rider. This sport is considered a great favourite with the extremely macho men who like to boast about their high testosterone level and are ready to take on any pain for the sake of it. While the fall can cause severe injuries and concussions, the bull, which can weigh up to 1800 pounds, may trample the fallen rider. But, for some, beyond the pain and fear lies an art.br br 4. Cave divingbr br Cave diving is an unusual sport which involves underwater diving in caves with at least partial water content. Besides the use of regular scuba equipment in specialized configurations, it uses a varied range of equipment, depending on the circumstances. Major hazards of this sport are caused my lighting failure and low visibility, which can lead to separation from the partner. Air loss is another peril, especially because one can’t just rise to the surface to catch air, or he might smash his head.br br 3. Scuba Divingbr br While scuba diving has become a common term, most do not know that Scuba is actually an acronym for Self-Contained Underwater Breathing Apparatus, which is used by a diver for breathing underwater. While it sounds wonderful, but it comes with its perils.