【正确答案】 A

【答案解析】文章的第二段第一句话“…most physical-fitness tests have usually included measures of muscular strength and endurance，not for health-related reasons，but primarily because such fitness components have been related to performance in athletics．”，由此可以看出"physical fitness tests"的目的不是为了健康的原因，而是这些“fitness components"与运动中的表现有关，因此，[A]是正确答案。