《史记·七十列传·扁鹊仓公列传》
依照脉理说： 二十岁时人的脉气正旺应该做跑步的运动，三十岁时应该快步行走，四十岁时应该安坐，五十岁时应该安卧，六十岁以上时应该使元气深藏。 
脉法曰 年二十脉气当趋，年三十当疾步，年四十当安坐，年五十当安卧，年六十已上气当大董 。
According to the theory of pulse: at the age of twenty, the pulse is strong and suitable for running, at the age of thirty, it should walk fast, at the age of forty, it should sit still, at the age of fifty, it should lie down, and at the age of sixty, it should keep the vitality deep.