What happened
A private pilot was conducting a flight review recurrency flight when the instructor pilot requested a simulated forced landing. During the maneuver, the instructor reduced engine power to simulate an engine failure.
In an attempt to reach the approach end of the runway, the pilot stretched the glide. This action caused the airspeed to drop below the normal approach speed. While the aircraft successfully reached the runway threshold, it dropped onto the runway surface with enough force to cause substantial damage.
During the final stages of the maneuver, as the airspeed decreased below normal parameters, the instructor pilot did not apply power to assist the glide or command the termination of the simulated forced landing exercise.