Keeping in mind the ideas of PLAIN, what is the most effective revision of this document? a. It’s best if everyone would do some kind of exercise for at least 30 minutes on most, if not all, days.

b. Exercising at least 30 minutes every day by riding a bicycle, walking, doing calisthenics, gardening, or other activity is recommended.

c. The US Department of Health has found that daily exercise of some kind for at least 30 minutes a day will result in a healthier public.

d. Do at least 30 minutes of exercise, like brisk walking, most days of the week.

d. Do at least 30 minutes of exercise, like brisk walking, most days of the week

Explanation:

PLAIN or Plain Language Association International is meant to support the use of simple language in government documents.

Government documents based on PLAIN will be easy to read and understand by the citizens as it carries short and ordinary sentences that are more effective.

The most effective revision of this document from the given options is "d" as it represents simple language which is easy to understand in comparison to other given sentences.

Hence, the correct option is "d".