Woman preparing to lead a group in exercises

Photograph shows a woman standing with her arms stretched out from her sides in front of a group of people who are dressed in clothes they can move in easily. The woman is facing away from the group and may be preparing to lead them in some form of exercise. Many of the group have on matching tee shirts and are smiling at the woman with the outstretched arms. There is a microphone on the right side of the photograph in front of the group and the YWCA building is behind the group.