(bron: wikipedia)__NOTOC__
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 and the hands going overhead, sometimes in a clap, and then returning to a position with the feet together and the arms at the sides.
The name origin for the jumping jack exercise has sometimes erroneously been identified as World War I U.S. General John... meer
