 Image by Lance Cpl. Ryan M. Joyner, via Wikimedia Commons. Licensed Public domain |
The Jumping JacksJumping jack Jumping jack Physical jumping exercise This article is about physical exercise. For other uses, see Jumping jack (disambiguation). Not to be confused with Jump'n Jack. A jumping jack, also known as a star jump and called a side-straddle hop in the US military, is a physical jumping exercise performed by jumping to a position with the legs spread wide. The hands go overhead, sometimes in a clap, and then return to a position with the feet together and the arms at the sides. Schoolchildren in the US performing jumping jacks. The jumping jack exercise's origin has sometimes been erroneously identified as World War I U.S. General John J. "Black Jack" Pershing,[1] who is said to have developed it.… (Source: Wikipedia)
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