How do you harness the energy created by motion?

A turbine or a windmill converts wind motion into energy. Note that it actually has to intercept/stop the motion to do this. If you could build a perfect windmill, the air would perfectly calm on the other side of that windmill.
This is often done by generators, that produce electricity.
This is often done by generators, that produce electricity.
This is often done by generators, that produce electricity.
This is often done by generators, that produce electricity.