体力是力量、速度、耐力、灵活性、适应性和协调性的总和。体力的好坏取决于肌肉的收缩、体内糖元的分解、氧气的供应、心肺功能的健全,以及中枢神经系统的工作状态。在生命的长河中,体力不是一成不变的,也不可能无休止地保持强盛。它有一个由弱到强,由强到弱的变化过程。老年人常说:“年迈体衰,力不从心。”这是人濒于老化的一个重要表现。老年人体力衰退主要表现在:①肌肉逐 Physical strength is the sum of strength, speed, endurance, flexibility, adaptability, and coordination. Physical strength depends on muscle contraction, glycogen decomposition, oxygen supply, heart and lung function, as well as the working condition of the central nervous system. In the long river of life, physical strength is not static, it is impossible to maintain a strong endless. It has a change from weak to strong, from strong to weak. The elderly often say: “The elderly fail, unable to do anything.” This is an endangered people an important manifestation. Elderly physical decline mainly in: ① Muscle by