The pilot failed to maintain airspeed on short final resulting in a stall and a hard landing. The 253-hour private pilot and the 700-hour certificated flight instructor (CFI) were performing a power-off 180-degree approach to land when they overshot the runway while turning to final. Once realigned with the extended centerline of the runway, the flight instructor observed that the airspeed was indicating 70-75 knots while the single-engine airplane descended through an altitude of 200-feet above ground level (AGL). As the flight continued to descend to approximately 30-feet AGL, the private pilot "applied excessive back pressure" and established a pronounced nose-high attitude. The flight instructor attempted to push the nose of the airplane down; however, he was unable to overpower the student. The flight instructor reported that the pilot "did not immediately relinquish the controls when requested by the CFI." Once the flight instructor regained the airplane's controls, he added power to counteract the descent; however, the airplane stalled approximately 15-feet AGL and landed hard on the runway. An examination of the airplane revealed structural damage to both wings. No pre-impact anomalies with the airplane's controls were reported.