Sure! Here's the explanation to help you understand the meaning of the word "sedentary" in the given sentence:
1. The sentence mentions that doctors recommend exercise, especially for those who spend many hours doing sedentary activities like reading, watching television, or playing video games.
2. Based on the context clues provided, the correct definition of sedentary is:
B. To spend much time being seated
3. The word "sedentary" refers to activities that involve sitting or remaining in one place for extended periods without much physical movement.
In summary, in the context of the sentence, sedentary means spending a lot of time seated without much physical activity.