Which sentence uses a verb in the subjunctive mood?

1)
on the commercial, a doctor recommended that people exercise at least three times a week.

2)
i asked myself quietly, "how hard can exercising be? "

3)
i decided to go outside and run laps around the block.

4)
i wanted to cheer myself on, so i told myself, "go for it! "

5)
i clutched my abdomen, crawled back to my house, and turned on the tv while i waited to catch my breath.

6)
with a sigh, i said under my breath, "now he tells me."

for my fellow users who don't know what subjunctive mood is, basically it states a wish and uses words like were, was, or had. for example, "if you were " this means that you are not there, and wishes you were there. hopefully that makes sense?

wish you the best of luck! also, when answering, simply write the number of the sentence that shows subjunctive mood.