Here's the full sentence: Sitting or lying down to watch TV, read a book, type on a computer, or talk on the phone all requires about the same low level of energy expenditure. Should the verb be "require" or "requires"?? The subject seems to be two singular nouns joined by "or" so I thought the verb should be singular, but the "all" is throwing me off. Any ideas to rearrange to eliminate the awkwardness? I thought about changing it to "Activities such as sitting..." but the author is trying to make the point that these are periods of inactivity.