How long will you do aerobics <in/at> the gym?

Spanish
#1
Hello teachers,
Is it more natural 'in' than 'at' in the following questions? I think 'a' is better.
a) How long will you do aerobics in the gym? I'll do it for half an hour.
b) How long will you do aerobics at the gym? I'll do it for half an hour.

Thanks in advance.
 
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    Senior Member
    American English
    #3
    I would use "at" for the location, rather than "in" for the enclosure. You can do aerobics many places, so I think location is more important here.

    Added: Cross-posted with an aerobically fit Owl.
     
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