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)-.
Even though you're not flexing or twisting your torso while jumping rope, your stabilizers are hard at work to keep you upright. Because they function on a reflex base, you don't have to think about them or hold your abs tight. Just focus on your rhythm and footwork and your stabilizers will take care of themselves.