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This video is answering the member question, how do both arms supinate in the downswing?

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So I just posted a video from the World Golf Fitness Summit 2018 and I put up a bunch

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of 3D graphs and I basically talked about how both arms are going to supinate during

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the downswing.

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Now it makes sense with the left arm even if you think that it's going to do very little

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of it.

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If you look at this position, typically the elbow is pointing kind of there in the back

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of the hand is pointing out that way at impact.

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So there's the elbow pointing at impact.

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The elbow is still kind of pointing at the target so it hasn't rotated as much as the hand.

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But the hand is now pointing closer to the target.

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That's supination that got it there.

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Even if it's in a slightly pronated position still at this point, it is in the process

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of supinating.

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And then through impact, that elbow is pointing behind you and now the palm is pointing

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behind you or the back of the hand is pointing behind you.

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So it's gone through supination.

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That one's pretty easy to see.

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But what most people would assume is that if this one supinates, this one's going to

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pronate and arms are going to work more like this.

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But you could see that if I do that, that's not necessarily the position that I would

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want to get in here just after impact.

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So the way that pros typically do it is they're actually going to supinate this right

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form.

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Now there's two ways to supinate.

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One would be, I'm not going to move the elbow and I'm going to move the hand down in

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this direction and that would be considered supination.

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The other one is I'm going to keep my hand still and I'm going to turn my elbow so it's

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pointing more at the down-the-line camera there.

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So if I go from there to there and the hand doesn't move, that is also supination.

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So as much as the golfer is trying to prevent a big internal rotation of the shoulder

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pronation of the forearm kind of like this, if the forearm, or sorry, if the shoulder

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starts to rotate before the palm does, that's going to show up as supination because

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my forearm is actually rotating in this direction.

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The supination of that trail arm right around here helps to shallow the club and match

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the unhinging of the lead wrist.

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So one way to kind of think of it is the lead wrist is rotating like this and the trail

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wrist is rotating more like that even though it's going more across the body at the

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same time that it's doing it, you can see that the shoulder is coming out of its rotation

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before the hand.

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If the hand comes out of the rotation before the shoulder, it'll be a high pronation

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value.

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If the shoulder comes out before the hand, it'll show up as supination.

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So if I go in slow motion and you were to look at this right forearm as that's extending,

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the right arm is actually staying facing more this way and it's my body that's bringing

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it around that forearm staying more this way is supination.

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So to me it almost feels similar to like a chest pass where the arms would be rotating

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both this both like that which is supination but whether or not you're able to feel

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that supination through here or you feel the pronation from impact until follow through

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that doesn't change the fact of what the graph show and they show it pretty consistently

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that typically the elite level golfers are supinating that trail arm from right about

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here until the club is just about here before you actually start to see the pronation.

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So hopefully this clears up a little bit what's going on in the down swing and you're

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able to kind of visualize how this arm, how the data would match up with what you might

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feel and while it's tricky to initially get a sense yes in the elite level swing both arms

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are supinating during the downswing.