I think the Sherbin movement is quite effective. You can download some videos and learn to do it yourself. Only do upper body movements. I am fat, too, especially in my arms.

Thin arms can do Shebin exercise every day and rub their arms at night to avoid growing muscles. It has improved a lot now.

Can refer to the upper abdomen. The rib breathing method in the first phase of women's largest (local slimming ballet yoga) will flatten the abdomen.