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)-.
Although jumping jacks are effective on their own, you can add weight to your body to increase the challenge of this exercise. Ankle weights, wrist weights and even a weighted vest will require your body to work harder, which will help exercise your muscles and burn calories even faster.