What is a benefit that results from regular endurance/aerobic training?

Regular endurance or aerobic training leads to increased blood volume, which is a significant physiological adaptation. This enhancement occurs due to several factors: the body responds to the increased demands placed on it during sustained physical activity by expanding blood plasma volume, and also through an increase in red blood cell production.

Having a higher blood volume improves the efficiency of the cardiovascular system, leading to better oxygen delivery to working muscles during prolonged activities. This increased capacity helps enhance overall endurance performance, as more oxygen-rich blood can reach the muscles, supporting aerobic metabolism and helping to improve stamina and recovery times.

In contrast, the other options do not represent benefits associated with regular endurance training. For example, increased lactic acid production is often a byproduct of anaerobic activity, and while some lactic acid can be beneficial for energy production, excessive accumulation can lead to fatigue. Increased creatine phosphate storage is primarily linked to anaerobic training rather than aerobic. Lastly, delayed onset of muscle soreness (DOMS) is more related to the intensity and type of exercise rather than being a direct benefit of regular endurance training.