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)-.
1 Moderate intensity: according to experts, a person weighing 150 pounds can burn up to 153 calories (5.1 calories per minute) during a moderate intensity jumping jacks exercise that lasts for half an hour.2  Aperson weighing 200 pounds can burn up to 204 calories (6.8 calories per minute) for the same amount of time. Moderate intensity: according to experts, a person weighing 150 pounds can burn up to 153 calories (5.1 calories per minute) during a moderate intensity jumping jacks exercise that lasts for half an hour.