Names of people Cat Thisius finds inspiring can be seen on the inside her helmet as she gears up for a MedCity Mafia roller derby practice Wednesday, April 25, 2018, at the Boys and Girls Club of Rochester. Thisius returned to practice the week before after having surgery to treat her breast cancer earlier this year. "I'm amazed at the progress from this week to last," Thisius said later in the practice. "Nothing hurts," she said.