Not everybody understands the passion others have for climbing gyms or rock climbing.

Stephanie Pound, a self-described non-athletic bookworm from Cal, said she didn’t get it herself at first.

“When I was introduced to it, I was not an athletic person,” Pound said. “I was working at REI in Berkeley and my brother took me to Indian Rock (in the Berkeley hills) for the first time. We started going to the climbing gym and I fell in love with climbing.”

At Planet Granite in the Presidio this week, Pound, who now oversees the Planet Granite gyms around the Bay Area, showed how the place was alive with energy. Approximately 150 climbers were working their way up different walls and solving “boulder problems.”

In the past 10 years, climbing has risen from a cult sport to near mainstream with more than 20 climbing gyms in the Bay Area that are open as late as 11 p.m.