Hello teachers, Surfing on the net I found that the word 'aerobics' can take either a singular or a plural verb. Though I also found this definition in the forum: aerobics = a physical exercise = singular verb * ==> (Always needs a singular verb) Then, I assume that in the answer both object pronouns are possible, aren't they? How long will you do aerobics at the gym? a) I'll do it for half an hour. b) I'll do them for half an hour. Thanks in advance.