Wikipedia definition of extreme sports: The term nowadays applies more to youth sports like skateboarding, snowboarding, and BMX and is closely associated with marketing efforts aimed at youth (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.
Wikipedia definition of link exchange: Link Exchange ("Reciprocal Link Exchange") is a practice of exchanging links with other websites. There are many different ways to arrange a link exchange with webmasters.