The author explains the physiological differences between a sedentary life-style and one where athletic activity plays a role. He goes on to give a brief outline of the inevitable biological processes associated with old age. Finally, he sets out the conditions for regular exercise in later life and lists the types of sport most suitable for this purpose.
作者解释了久坐不动的生活方式与体育活动起作用的生活方式之间的生理差异。他接着简要概述了与老年相关的不可避免的生物过程。最后,他阐述了晚年定期锻炼的条件,并列出了最适合此目的的运动类型。