Stream19 is a social network for action sports lovers! A social network not for everybody... exclusive for you, join now! skateboarding bmx parkour snowboarding extremesports

Extreme sports differ from standard sports due to the relatively higher number of inherently uncontrollable variables in extreme sports. Extreme sport athletes compete not only against other athletes, but also against environmental obstacles and challenges. These environmental variables are frequently weather and terrain related, including wind, snow, water and mountains. Because these natural phenomena cannot be controlled, they inevitably affect the outcome of the given sport or event. In a standard sporting event, athletes compete against each other under controlled circumstances. While it is possible to to create a controlled extreme sporting event, there are often variables that cannot be held constant for all athletes. Examples include snow conditions for snowboarders, rock and ice quality for climbers, and wave height for surfers. The definition of extreme sports may have shifted over the years due to marketing trends. When the term first surfaced circa the late 1980s/early 1990s, it was used for adult sports such as skydiving, scuba diving, surfing, rock climbing, snow skiing, water skiing, snowboarding, mountain biking, mountaineering, cave exploration, storm chasing, hang gliding, and bungee jumping, many of which were undergoing an unprecedented growth in popularity at the time BMX (an acronym for Bicycle Motocross) is a form of cycling on specially designed bicycles which usually have 18 to 24-inch wheels (the norm being the 20-inch wheel). The sport includes racing on earthen tracks, known as BMX racing, as well as the performance of tricks on the bikes, called Freestyle BMX. Skateboarding is the act of riding on and performing tricks with a skateboard. A person who skateboards is referred to as a skateboarder or skater. Parkour (sometimes abbreviated to PK) or l'art du déplacement[1] (English: the art of displacement) is an activity with the aim of moving from one point to another as efficiently and quickly as possible, using principally the abilities of the human body.[2][3] It is meant to help one overcome obstacles, which can be anything in the surrounding environment — from branches and rocks to rails and concrete walls — and can be practiced in both rural and urban areas. Parkour practitioners are referred to as traceurs, or traceuses for females