体力可分为防卫体力和行动体力两种。所谓防卫体力,即抗御外来刺激的抵抗力,是保卫个人健康的主要防卫能力。行为体力则是把自己的能量向外发挥的体力,即肌力、速度和耐久力等。体力和年龄的关系极为密切。日本学者在论述体力与年龄的关系时这样举 Physical strength can be divided into two kinds of defense physical strength and physical activity. The so-called defensive physical strength, that is, resistance to external stimuli, is the main defense capability of defending personal health. Behavioral physical exertion is the physical exertion of exerting one’s energy outward, that is, muscle strength, speed and endurance. The relationship between physical strength and age is very close. Japanese scholars in the discussion of physical and age of such a relationship