Because Radical groups advocate extreme and immediate change.

Probably either Mount Washington for its height and extreme conditions, or Mount Monadnock for its popularity and accessibility.

Because through marketing, such as volvant.com, companies generate extreme amount of profit, income and popularity.

Markus Ruhl is most well known for extreme weightlifting as well as extreme body building. Ruhls popularity is often due to his freakish size and steroid abuse which has made him extremely muscular.

Recliner chairs have maintained their popularity for three reasons. The health benefits of elevating legs is well documented. In addition, recliners offer extreme comfort. Recliners have also changed to use less space and become more fashionable.