It was August 2017, and Sonya Pevzner stood on a small ledge, halfway up Washington’s imposing Mount Shuksan. With eight hours of climbing in the rearview mirror, only a single belay pitch stood between her and solid ground. Nervous jitters coursed through her body, leftovers from the stressful rappelling. But she felt something else, too: elation. She glanced around the ledge and saw a handful of women – no men – packed together to accommodate each other in the cramped space.