Good question. Say you spin like a ballerina in a circle, that force that pulls up your arms (angular momentum / centrifugal force). But why should your arms go

Good question. Say you spin like a ballerina in a circle, that force that pulls up your arms (angular momentum / centrifugal force). But why should your arms go up? If you take the person's face's point of view, the arms are still and some mysterious force is pulling them up. This is because it is relative to the CoM and spin of the universe itself (although things get a bit wonky when we look at this even closer).