The gym was quiet at this time of night, with only a few dedicated patrons scattered throughout the space. After a long day at work, I stepped onto the treadmill and noticed her—again. She was across the room, working with free weights, her form impeccable. Dressed in black leggings and a sports bra, her hair pulled back in a messy ponytail, she exuded an intensity that was hard to ignore. I had seen her here often, and e...