Hula hoop actually exercises the waist and lower body, and sit-ups mainly reduce the abdomen.

I've tried both, and the results are good, but sit-ups are too tired to persist. But the effect will be better,

Personally, I still recommend hula hoop. You won't be too tired. You can do something else. I can read books or listen to music or watch movies while shaking.

Hehe, but these two points must be adhered to, otherwise the effect is not great.