Follow up question:
If a human can do this rotation, does this mean that in theory a spaceship that is moving but not accelerating could choose to start rotating simply by moving its parts correctly? I'm talking about a rotation with little to no effect on direction and without using thrust.
This isn't a homework problem or anything, it's just something I'm in a debate with someone about. Theoretically, if an astronaut were left stranded in the center of a room without the ability to push off of anything and without any means of propulsion -- would the astronaut be able to do a 360...