Robert Bosch, Extreme Photographer

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, storm chasing, hang gliding, and bungee jumping, many of which were undergoing an unprecedented growth in popularity at the time. Outside magazine, not the X Games, epitomized the meaning of the term, and if there was a clothing style associated with extreme sports it was an "outdoorsy" look favoring brand names associated with mountaineering or backpacking such as The North Face and Patagonia, Teva sandals or hiking boots for footwear, etc. The term nowadays applies more to youth sports like skateboarding, snowboarding, aggressive skating, FMX and BMX and is closely associated with marketing efforts aimed at the younger generation (e.g. the ad campaigns of Mountain Dew), and with their favored styles of clothing and music, especially the kind of urban baggy look associated with skateboarders, and loud, fast alternative rock. This shift in styles may also be partly a generational shift, as Baby Boomers and Generation X have aged and marketing efforts associated with extreme sports shifted toward the younger Generation Y demographic sometime in the mid to late 1990s.
The term gained popularity with the advent of the X Games, a made-for-television collection of events. Advertisers were quick to recognize the appeal of the event to the public, and as a consequence competitors and organizers are not wanting for sponsorship. The high profile of extreme sports and the culture surrounding them has also led to parodies such as Extreme ironing, urban housework, extreme croquet, and house gymnastics.
• Adrenaline rush
A feature of such activities in the view of some is their alleged capacity to induce an adrenaline rush in participants. However, the medical view is that the rush or high associated with the activity is not due to adrenaline being released as a response to fear, but due to increased levels of dopamine, endorphins and serotonin because of the high level of physical exertion. Furthermore, a recent study suggests that the link to adrenaline and 'true' extreme sports is tentative. The study defined 'true' extreme sports as a leisure or recreation activity where the most likely outcome of a mismanaged accident or mistake was death. This definition was designed to separate the marketing hype from the activity. Another characteristic of activities so labeled is they tend to be individual rather than team sports. Extreme sports can include both competitive and non-competitive activities.