If it is too heavy, the abdominal muscles will be sore and will not consume excess calories. In addition, the hula hoop will bump into the internal organs (such as kidneys) of the abdomen and back when shaking. Too heavy hula hoop will hit the internal organs relatively, which will hurt the internal organs. Still have to choose a moderate weight.

A diameter of about 2 cm to 3 cm is enough. After all, you lose weight by strengthening the range of abdominal rotation, not turning your stomach.

It was you who bought it for the first time. At that time, I didn't understand. I thought it was okay to wrap such a thick soft layer outside, but when I came back, I found my stomach ached. Now use it as a stretching ring, and I don't dare to use it to turn my abdomen. It can also be used to practice stretching, which is quite useful.