Inactive people should start with small amounts of physical activity and gradually increase duration, frequency and intensity over time.
缺乏活动的人在开始时应做少量的身体活动，并随时间逐步增加活动时间、频率和强度。
It is appropriate to start with smaller amounts of physical activity and gradually increase duration, frequency and intensity over time.
适宜的方法是，从较小的活动量开始，然后随着时间的推移，逐渐增加持续时间、频度和强度。
Once you get used to the process, increase the frequency and/or duration, but it’s more important that you keep at it over time than it is that you’re consistent in intensity over time.
等到你已经习惯了之后，再增加次数和强度，但最重要的是保持这个习惯而不是每次都要求保持强度。
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