In case of human motion, one would not expect angular momentum to be conserved when a body interacts with the environment as its foot pushes off the ground. Astronauts floating in space aboard the International Space Station have no angular momentum relative to the inside of the ship if they are motionless. Their bodies will continue to have this zero value no matter how they twist about as long as they do not give themselves a push off the side of the vessel.
Is angular momentum completely analogous to linear momentum? What, if any, are their differences?
OpenStax College Physics 2e, 10.5 Angular Momentum and Its Conservation, exercise 1