High impact aerobics primarily involves what kind of movements?

High impact aerobics predominantly involves movements that generate a significant force through the lower body, specifically actions where both feet leave the ground simultaneously. This includes activities such as jumping, hopping, and other plyometric exercises. These movements elevate the heart rate and enhance cardiovascular fitness, muscular strength, and endurance while contributing to higher calorie expenditure.

In contrast, options that involve low-intensity movements typically refer to lower impact exercises designed to be gentler on the joints, which do not align with the high intensity associated with high impact aerobics. Only upper body movements would not characterize high impact aerobics since this form of exercise primarily engages the entire body, particularly the legs and glutes. Lastly, static poses do not involve the dynamic movements necessary for high impact aerobics; they focus on holding positions rather than engaging in cardiovascular or strength-building activities that require vigorous movement. Therefore, the correct choice reflects the essence of high impact aerobics as an active and forceful workout style.