Cat Thisius, who plays on the MedCity Mafia roller derby team, laughs after falling down with teammate Ashley Jones while taking part in some of her first contact drills since rejoining the team during a practice Monday, May 7, 2018, at the Boys and Girls Club of Rochester. Thisius returned to practice in April after having surgery to treat her breast cancer earlier this year. Monday's practice was her first practice taking part in contact drills. "No, I'm ready," she said of whether or not she was nervous.