How it works: A ski boot locks into the binding, which is attached to the ski in order to allow the user to transmit actions and power from their body to their skis. If a person leans backwards for something like a tail press: The binding has to transmit the force of you moving your body into the ski, causing the deflection as shown. Bindings are built with elasticity in them, so that their is some buffer space for the person to not have to perfectly execute every movement. Forces are pre-loaded on the boot by the binding down into the ski and forward on the ski to prevent play in these directions. The boot is made of stiff plastic that can withstand the compression forces.