This section is from the book "The Art Of Golf", by Bart W. G. Simpson. Also available from Amazon: The Art of Golf.
The left elbow-joint, as a joint, has no part in a true swing. But it is a prevalent habit to close it a little after the club has circled back as far as it naturally should. This is not quite so silly a way of giving one's-self the sensation of swinging far as is dropping the club over the shoulder by means of the wrist joints. But it is foolish enough, particularly if the player begins his swing with straight instead of slightly bent arms, in order to have more elbow-bending to do afterwards. Any one can see, when it is pointed out, that this joint work is merely a break which has to be mended before the sweep forward commences. Yet good players often take to it for a time if their driving is not satisfactory, feeling, in spite of common-sense, that they are lengthening their reach.
It would be profitless to describe more of the endless twists and twiddles with wrists and elbows which golfers acquire, seeking for a long swing in the wrong way, which is the same thing as seeking for it at all. Hundreds of balls are daily ' foozled' which would be struck but for these little spasms after the club has reached its proper goal. One-sees them all over the links. They remind us sometimes of hairs which have; grown too long and split at the ends; sometimes they suggest blind men groping their way.
It must strike any one who thinks of it, as curious that so many should wander so far from the main road in search of a swing. One reason is, as already indicated, that swings are among the things which, according to Longfellow, 'are not what they seem.' Hence the errors of imitators. The professional appears to wind his club round his back. It is not so. It is the club which winds round him, not because he wishes it to do so, but because his muscles, though knit, have their natural elasticity. The player is in the centre of a circle, at a point in the circumference of which is the ball. The more nearly his club head describes a perfect segment whilst driving, the better. But it is not possible to make a true circle swiftly with a springy wire, which the player is. or a springy club shaft, if you will. He is even a bad shaft, weak in some places - for example, at the wrists. Let a player look upon his left arm as a part of a club. He can see at once that it will not lengthen his driving to have a break in it somewhere. He might as well expect to lengthen his swing by putting joints in the actual wooden shaft, strengthened (say) with strong india-rubber bands, spliced over them, to imitate human joints. In other words, every joint of the fine drivers left arm below the shoulder is as taut as the extensor muscles (I rather think these are the ones) keep it without undue attention to the point. I have said the left arm. I should sa\ nothing about the right, were it not that I might be supposed to mean that it too was to be treated as part of the shaft, and that I was advocating that stiff dunch from the shoulder with arms not naturally bent but rigidly straight, by which many late beginners remove their ball from the tee. In true driving, the left arm has to accommodate itself in the swing back. It is loose and obedient. Its elbow joint has to flex, and it is not until it is brought back to within a foot of the ball that it joins with the other in the work of driving - not till after impact that it becomes master, the other slave.
Fine players are not only apt to lead others astray by appearing, to the superficial observer, loose and flexible in every joint, but knotless contortionists, who are really so, look stiff and ponderous. Learners are thus doubly impressed with the idea that a free and a flabby swing are one and the same thing. Nor is it easy for them to be disabused of their error. No man can see himself strike, and thus learn that the swing he has adopted, the flexibility he feels, is visible not as ease but as awkwardness. Nor is there much chance of finding out his errors by comparing his sensations with those of good players, who, as a rule, pay no attention to such matters. Curiously enough, if pressed to say something, it will often be (I have got this answer from many professionals), ' My longest balls are when I feel I 've got my wrists into it.' This misleads the tyro terribly, although it is true. The professional gets this sensation from a full, taut, india-rubbery swing. It is the result of his determination to get back to the ball as soon as possible. The other takes it to mean that he ought to get as far from it as he can by allowing the club to master his wrists. One day an adversary sought my praise for the way in which he was driving with his iron. I said (which was apparent), ' You have a fuller swing with it than with the play club.' ' You mean the opposite,' he answered. I repeated my commentary, and he rejoined, ' That is curious. I 've been off my iron play, and am getting into it again by taking a half swing.' But I was right, which he admitted after experimenting in the matter. In driving from the tee this player had a long - a very long - swing, if by that is meant the distance the club head meandered away from the ball before coming back to it. In addressing, his arms, instead of having the natural bend, were straight as bars. They took the club a long way off, flexion of the left elbow took it further, flexion of the wrists another loot. Bystretching, over-reaching, relaxing, his journey was the longest possible; but travelling far and swinging long are different matters. With his iron he described a true segment of a circle, every muscle as stiff and taut all the time as when the ball was struck.
In short, then, a good swing seems to the on-looker swift and flexible; but if the player feels supple, he exhibits an awkward, stiff, straggling movement. The player ought to be, in his own hands, a stiff bow which he bends and shoots with. Of course, by practice, he learns to bend this bow with ease, and to shoot with accuracy. But when he goes off his driving the remedy is not to lengthen and loosen the string, but rather to tighten and shorten it.
 
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