Can you lose weight by rubbing your stomach really fast?

No, you can't.

No. All you will do is make an area on your skin sore, bruised, and give you blisters. In the 1950s and 1960s a machine with a belt was made for weight loss. People stood on a platform with the belt around them. It juggled the fat and that is about all it did. Truth is diet and exercise are the only ways to lose weight.