Yoga
Yoga is a spiritual, mental, and physical practice which originated in India.
"Yoga is possible for anybody who really wants it. Yoga is universal.... But don't approach yoga with a business mind looking for worldly gain." -Sri Krishna Pattabhi Jois
Yoga Culture
Yoga is very popular in the United States and certainly has it's own subculture. Here is very funny music video/song that pokes fun at the yoga-persona stereotypes.
Yoga Journal
The magazine Yoga Journal is very popular in the United States. It is a great resource for all things yoga. It also has a website.