Does a hula hoop can help my stomach flat?

Ultimate full body workout helps me a lot to do some exercise every morning. Because I only visit a gym occassionally. And every afternoon, I always use hula hoop as my exercise for my stomach. Is it helpful? I search through internet about this, and it said that it's true. But I'm still confuse about this. Dunno why
Does a hula hoop can help my stomach flat?
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