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)-.
How to do the Plank Jack: 1  Step 1: Get down on your forearms and toes, and make your body into a straight line. 2  Step 2: Jump slightly with your toes and spread your legs out.  Step 3: Jump again slightly with your toes and bring your legs back together.