Arcade Library is not a quiet place. At least not when librarian and roller-derby coach Jessica Zaker is around. The tattooed administrator is on a crusade to redefine the community space with fitness programs. A Zumba class is taught in a back room at the Southgate Library on January 25, 2014, as part of a wider library fitness movement to get more 20-somethings in the buildings. Lexie Kalbach leads a Zumba class taught in a back room at the Southgate Library on January 25, 2014, as part of a wider library fitness movement to get more 20-somethings in the buildings. Lexie Kalbach leads a Zumba class taught in a back room at the Southgate Library on January 25, 2014, as part of a wider library fitness movement to get more 20-somethings in the buildings. With a cardboard cutout stashed in a corner behind some flags in a back room at the Southgate Library, Yajaira Martinez, 25, follows along in a Zumba class on January 25, 2014.