Now even the older crowd is starting to join in. Every weekend a group of friends in their early 30s get together. During the week they work as computer programmers in the same office. On Sundays they rent mountain bikes that cost $2,000 each and ride down steep mountains together.
Extreme sports are certainly not for everyone. Most people still prefer to play baseball or basketball or watch sports on TV. But extreme sports are definitely gaining in popularity. "These sports are fresh and exciting. It's the wave of the future. The potential is huge," says Nussbaum.