The name origin for the jumping jack exercise has sometimes erroneously been identified as World War I U.S. General John J. "Black Jack" Pershing, who is said to have developed the exercise, but in fact the name comes from the jumping jack children's toy, which makes similar arm swing and leg splay motions when the strings are tugged.
Działa: [img][/img], [code][/code] i [quote][/quote]
Może działać: cytowanie posta >>
Dwa entery to nowa linia.
Stare posty są usuwane.