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)-.
Lunge jumps rely more on thigh and hip strength than they do calf strength; however, these relatively small but powerful muscles still have a part to play. Your larger calf muscle, the gastrocnemius, crosses the back of your knee and ankle joint and is involved in extending your ankle as well as flexing your knee.