Free Stock Photo: This image depicts a class in session, the purpose of which was to instruct a number of Centers for Disease Control (CDC) employees through an aerobic step session, consisting of attendees following the participatory commands of an instructor, who was pictured here, standing at the front of the class. In this particular scene, while standing, attendees held small, 2.5lb dumbbells in both their outstretched hands, building upper body strength while aerobicizing.
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