Jumping Jack

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A Jumping Jack (US) or star jump (Commonwealth nations), 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 and then returning to a position with the feet together and the arms at the sides. The jumping jack name comes from the traditional toy of the same name, while "star jump" refers to the person's appearance with legs and arms spread.

More intensive versions of this jump include bending down (over) and touching the floor in between each jump.

A similar jump exercise is called half-jacks. They are just like regular jumping jacks, but the arms go halfway above the head instead of all the way above the head. The arms also hit the sides to help tighten the jump.

Although he played no part in inventing the exercise, jumping expert Jack LaLanne takes credit for having popularized it in the United States as part of the jumping exercise routine he promoted on decades of television programs.

Currently the world champion of jumping jacks is Bill Kathan.[1]

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