Which best defines anaerobic activity?

Anaerobic activity is best characterized by high-intensity workouts done in short bursts. This form of exercise relies on energy sources stored in the muscles rather than oxygen from breathing. During anaerobic activities, such as sprinting or heavy weightlifting, the body engages in quick, intense movements that exceed the capacity of the oxygen supply. As a result, it utilizes energy systems that do not require oxygen, allowing individuals to perform at high effort levels for a limited time before fatigue sets in.

In contrast to anaerobic activity, exercises done at a sustained pace or activities requiring oxygen for extended periods focus on endurance and aerobic capacity, where the body is making continuous use of oxygen. Long-duration, low-intensity exercises also fall into the aerobic category and are not indicative of the short-duration, high-intensity nature of anaerobic workouts. Thus, the definition that aligns with the characteristics of anaerobic activity highlights its intensity and the quick energy expenditure that occurs without the involvement of oxygen.