Macsprint is correct. You know when someone tells a funny joke, and then as it is passed on and mis-told and mis-interpreted from person to person, it becomes less funny or even unfunny. Same idea here. These drills are passed on from moron to moron and no one actually checks with the guy who came up with the drills to make sure they are correct. The problem with YouTube is that it accelerates and proliferates this nonsense.