How to calculate the number of hula hoop games?

Calculated by the number of revolutions in the specified time.

According to the rules of the hula hoop competition, the hula hoop is rotated by the waist, and then the referee counts how many turns it has made in the specified time, that is to say, how many turns it has made.

It should be noted that when twisting the waist, you should keep the hula hoop from falling down and always rotate smoothly.

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