Which of the following is a common trait of athletes with advanced cardiovascular fitness?

A common trait of athletes with advanced cardiovascular fitness is a low resting heart rate. This phenomenon occurs as a result of regular, intense cardiovascular training, which strengthens the heart muscle and increases its efficiency. A well-conditioned heart can pump a greater volume of blood with each beat, allowing it to require fewer beats per minute to supply the body with adequate blood flow at rest. This adaptation is a hallmark of athletes who engage in endurance sports, reflecting their superior cardiovascular health and fitness levels.

In contrast, options such as a high metabolic rate, increased body fat, and frequent fatigue do not typically align with the characteristics of well-trained athletes. Generally, an advanced cardiovascular fitness level is associated with a more efficient metabolism and lower body fat percentages rather than a higher metabolic rate. Furthermore, athletes tend to experience less fatigue due to their improved endurance and recovery abilities, rather than frequent fatigue, which would suggest overtraining or insufficient conditioning.