Yes, cupping is also a tricky job. It's not just sucking cans. It depends on how much force is needed in a certain part, otherwise it will only be counterproductive. Although it's not that serious, cupping is aimed at all acupuncture points in the human body. Acupoints in the human body are amazing. If cupping at a certain point is very strong, it will cause discomfort or even more serious to the body.
Hope to help you, hope to adopt!