Shape Up New York
Recently, I started participating in the Shape Up New York program. This is a FREE fitness program for the whole family. There are loads of classes and activities to choose from during the week. No pre-registration required - just bring some ID. All classes are one hour in length.
I loved the hip hop aerobics on Monday evenings at the Pelham Fritz Center and the step aerobics on Thursday evenings at Harriet Tubman school. Both facilities are in Harlem. My favorite instructor is LeShawn - she is so fun!
http://www.nycgovparks.org/sub_things_to_do/programs/shape_up_ny/shape_up_ny.html