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"Jumping Jack." Wikipedia. Wikimedia Foundation, 30 Mar. 2014. Web. 01 Apr. 2014.
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A jumping jack or star jump, also called side-straddle hop in the US military, is a physical jumping exercise performed by jumping to a position with the legs spread wide and the hands touching overhead, sometimes in a clap, and then returning to a position with the feet together and the arms at the sides.