What best describes anaerobic conditioning?

Anaerobic conditioning involves high-intensity exercise performed in short bursts, typically lasting from a few seconds to about two minutes, with intervals of rest or lower intensity activity. This method is primarily geared towards improving strength, power, and muscle mass, as well as increasing overall athletic performance.

During these short periods of intense effort, the body relies on energy sources stored in the muscles, such as ATP and creatine phosphate, rather than relying on oxygen to generate energy. As a result, individuals may not maintain a steady heart rate nor engage in prolonged activity, which differentiates anaerobic conditioning from other forms of exercise like aerobic conditioning that emphasizes longer durations and steady heart rates.

The other options do not accurately reflect the characteristics of anaerobic conditioning. Maintaining a steady heart rate over an extended period, for instance, is more indicative of aerobic exercise. Using oxygen as a primary energy source typically describes aerobic activities, and building flexibility and endurance is generally associated with different types of training. Hence, the focus of anaerobic conditioning on short, high-intensity efforts with rest periods directly captures its fundamental nature.