Which factor is included among environmental and lifestyle influences on cardiorespiratory fitness?

• A. Smoking, alcohol, and drug use
• B. Genetic mutations
• C. Bone density
• D. Hair color

Answer: (A)

Environmental and lifestyle influences shape how the heart and lungs work during exercise. Among these, smoking, alcohol, and drug use are classic lifestyle factors that directly affect cardiorespiratory fitness. Smoking damages lung tissue, reduces airway function, and lowers oxygen uptake, which lowers endurance and overall aerobic capacity. Alcohol and drugs can disrupt cardiovascular regulation, hydration, sleep, and metabolism, all of which can blunt training adaptations and performance. In contrast, genetic mutations are inherited factors, bone density relates to skeletal health rather than the heart and lungs’ function during activity, and hair color has no impact on cardiorespiratory fitness. So, smoking, alcohol, and drug use best fits the environmental and lifestyle influences on cardiorespiratory fitness.