to do aerobics at three/in a group of three

pinkie112233

Member
Czech
Hi,

I´m not sure if it´s possible to say "to do aerobics at three" - it sounds like at three o´clock, doesn´t it? :)
I´d say "to do aerobics in a group of three - am I right? Or "in the group of three"? I still have some problems with articles...

Thanks.
 
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