The best and most correct answer among the choices provided by the question is the third choice "cardiorespiratory fitness"
Cardiorespiratory fitness<span> is the ability of the body's circulatory and respiratory systems to supply fuel and oxygen during sustained physical activity.</span>
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The answer would be : C. Increase the intensity of cardiovascular workouts
cardiovascular workouts are the best one to increase the target heart rate. By increasing it's intensity, Xavier will increase his heart rate to the point where he managed to achieve his target
Understanding the evolution of HIV in an individual will help scientist understand how the virus responds to different drug regimes and will lead to better treatments