What best describes a likely adaptation of the body to regular endurance training?

Regular endurance training leads to several physiological adaptations in the body that enhance cardiovascular efficiency and overall fitness. One of the most notable adaptations is the decrease in resting heart rate.

As an individual engages in consistent aerobic activity, the heart becomes more effective at pumping blood. This increased efficiency means that the heart can deliver the same amount of oxygen-rich blood to the muscles with fewer beats per minute. Consequently, just like a well-tuned engine, a trained heart requires less effort to maintain a stable output, resulting in a lower resting heart rate.

This adaptation is significant as it indicates a strong cardiovascular system that supports physical performance and recovery. Over time, the decrease in resting heart rate can also contribute to improved endurance during exercise sessions, allowing individuals to sustain higher levels of activity with less strain on their cardiovascular system.