There once was a man with weak legs. A team of experts was called in to decide how to treat him. The most expert of the experts suggested, and consensus was quickly reached, that the man should spend most of his day walking on a treadmill.
Things went well for a week or so, but the man got bored and decided to get off. The experts decided to place the treadmill in a little room, so that when he was walking on it, there would be no place else to go.
The next day, after a few minutes on the treadmill, the man decided to sit down. However, sitting on a treadmill is very dangerous; he was knocked over and he bruised his head on the bar. In order to insure the man's safety, the team of experts decided to handcuff the man's right hand to the side bar of the treadmill. This would prevent him from sitting down.
Unfortunately, he tried to sit down anyway, and badly injured his right shoulder. The team of experts decided to handcuff his left hand to the front bar of the treadmill as well; then he certainly would not sit down. This time, the man knelt on the treadmill, wrenched both of his shoulders, and had his knees and chin badly scraped by the belt.
The experts arranged for additional staff to be hired to stand on either side of the treadmill when the man was placed on it, and to bring him back to his feet whenever he tried to kneel. However, the new staffpersons quickly developed bad backs from hoisting the man back to his feet; they began to devise their own ways to keep him from kneeling, which the experts felt were both cruel and unprofessional.
Finally, the team of experts called in an outside expert, more expert tha any of the other experts already involved. This expert chided them for their lack of expertise. "Stovepipes!" he said. "Put his legs in stovepipes, and then kneeling will no longer be a problem." They did this, and kneeling was no longer a problem.