The likelihood of a student rolling it up at the bottom of a practice auto is extremely more likely than the engine actually quitting in the first place! I have to agree with “the coyote” & “ t’aint natural” Although I believe a CPL line pilot who wishes to keep their “eye in” or so to speak, should practice forced landings etc, but not to the ground. This will enable the pilot to keep his or her judgment sharp. I was once told by a C.F.I, to who has over 16000 hrs heli (8000 instructing), that he would on occasions during flight, (obviously without pax) close the throttle without allowing himself prior time to selecting a suitable landing area and then proceed with selecting area etc, just for practice. And stated that this was sufficient in keeping judgment, awareness, and control of his aircraft. He would then save the touch down practice for a suitable location with known terrain just in case something actually went wrong. I like his method, but can understand that a student pilot or a pilot who is not flying regularly is risking more than they might potentially gain! . .. .Just an opinion!