In that video they are running large AC electrical current through the shaped wire that is close to the ways. The changing electrical current causes a changing magnetic field which is impinging on the metal ways. This induces currents to flow in the metal ways which heats them up to bright red due to the resistance of the metal in the ways. This is called induction heating. The heat causes the metals to change crystal formations. After the ways are glowing hot then they quench it with the water to trap the way material's new state. When you quench some metals get hard and stiff depending upon their previous materials state. Others actually will soften. If you pound on copper with a hammer deforming it, or just flex a copper wire a lot, it will tend to get hard. This is called work hardening. If you keep flexing the wire it will break. However, if after pounding on the copper you then heat it up to glowing red and then quench it in water it will become soft again and you can pound on it some more to finish making it into the shape you want it to be.