Я должен обучить в гимнастике 3 раза в неделю.

Я должен сделать кругооборот, обучающий 3 раза в неделю в гимнастике.


I have translated the following sentences. I have a smattering of Russian. People go to gyms and train. I am doing circuit training.
Could you correct my Russian sentences?
[I must do circuit training 3 times a week at the gym.]