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In Russian it's the same:
Я сижу в(на) кресле
Я сижу на скамейке (you can't say в here)

на=on the surface of smth
в= inside smth
of course in some cases you just have to memorise

Oh yes, that's true :)

Was it "круговая тренировка"? I think it sounds even more Russian.

I am! :D


because it's inside the gym, HA спортзале would mean on the roof of the gym :)

I am doing circuit training. - я делаю круговой тренинг
I must do circuit training 3 times a week at the gym. - я должен делать круговой тренинг три раза в неделю в спортзале