There is also a special null type, the type of the expression null, which has no name. Because the null type has no name, it is impossible to declare a variable of the null type or to cast to the null type.
Transcript of Muscles Used for Jumping Jacks! Muscles Used for Jumping Jacks! FONTS. Muscles of the Abdomen- Anterior View. Rectus Abdominus. : Helps stabilize the movement to create pressure through a jumping jack. Muscles of the Lower Extremity. Anterior View (leg)-.
LaLanne used the jumping exercise during routines he promoted in decades of television fitness programming. Matthew Graul set the Guinness World Record for number of star jumps (jumping jacks) in one minute at 61, on May 17, 2008. Raymond Butler set a new record of 77 on September 18, 2013.