Aerobic refers to processes that require oxygen to produce energy. In the context of exercise, aerobic activities include running, swimming, and cycling, where the body uses oxygen to fuel muscles over extended periods. This type of exercise improves cardiovascular health and increases endurance. In biology, aerobic respiration is a metabolic process where cells convert glucose and oxygen into energy, carbon dioxide, and water. This process is essential for many organisms, including humans, as it provides the energy needed for various cellular functions and activities. Aerobic organisms, such as humans and plants, rely on this process for survival.