The Dynaflex Gyroscopic Dumbbell, uses a rotor that goes up to 13,000 RPMs.

It weighs only 1 pound yet puts out 38 LBS of torque.

Viewed through the constraints of an outside observer, there is no visible mechanical movement.

Attempting to explain it in Newtonian terms is not appropriate either, since the ball does not push against anything, nor does it have a jet.

An analogy in a similar fashion, there is no visible movement when Qi is flowed through the body, and directed into a martial strike.