There are just two chances remaining this summer to try out aqua Zumba as part of the city’s free fitness program. Head to Woodlawn Lake Park Pool at 6:30 p.m. tonight, Sept. 21, for a dance aerobics class in the water. Next week, on Sept. 28, the water workout season will close with a 7:45 p.m. glow aqua Zumba class featuring all of your favorite songs and dance moves plus glow sticks, bright colored suits and more. No registration is required, and admission is free. Wednesday, Sept. 21, 6:30 p.m.; Wednesday, Sept. 28, 7:45 p.m. 221 Alexander Ave.