WEBVTT

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This concept video is looking at how the feet work with the ground better known

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as ground reaction force. So I want to thank Mike Duffy for letting me use the

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visual that he presented at the open forum. It's a great way of visualizing

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that it's not just about pushing more and pushing harder, it's more about

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pushing

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in the right direction with a combination of how hard you push. So we speak a

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lot

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about the direction that we need to push both with the trail foot and with the

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lead foot. Hopefully this visual helps you understand and kind of strengthen

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that

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visualization of what it is you're actually trying to do with your feet

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against the ground. So again I want to thank Dr. Mike Duffy from Penn State

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University for sharing this great animation with all the Gulf smart

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academy members. I'm gonna walk you through basically what all these lines

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mean stuff like that I'll put a key over on the side for you and keep it there.

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If

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you're a golf instructor this is going to be invaluable. If you're a golfer

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this is going to be great for you to be able to visualize and I'll try to keep

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it simple enough that you can practically apply it to your own game. If you are

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a

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golf instructor I know that starting in the fall of 2015 Dr. Duffy is going to

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have a program that you can take to learn more about this kind of stuff and I

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highly recommend it he's one of the bright minds out there. So let's get into

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looking at how all these things change during the golf swing. But first let's

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walk through each piece. So this little green orb in the middle is going to be

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his center of mass and then the blue lines are going to be how each foot is

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pushing against the ground or the the ground reaction to how each foot is

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pushing against the ground. The yellow is the combination of those two located

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at the center of pressure. So first what we'll do is we'll walk through each of

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the different phases and then we'll go through and kind of break it down into

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each piece. And the last little thing is this this total frontal moment is

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basically showing the amount of rotational force or torque that I'm

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creating by pushing with my feet in certain way. So as an example if I were

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to change this and push with this left foot you can see that would cause me to

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have a moment or a torque and make my body want to tilt over to the right. If I

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was to not push with the left at all you could see that the combination is

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going to be just what I'm doing with the right and it's going to make me want

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to

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tilt to the left. So let's walk through the different phases of the swing and

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kind of take a look at how these things are changing. So here we have during

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the

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takeaway you're going to push with that front foot slightly down and away in

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order to create some of this rotation to get on to that right side. Now at

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early

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backswing I've shifted you saw the yellow line shift to the right so I've

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shifted my pressure over there and the blue line from the right foot is now

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pushing more towards my body. So basically I'm pushing slightly away from the

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target like this. As we move up towards the light backswing when the arms

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parallel to the ground you can see that the big difference is that the right

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foot blue line has shifted and pointed more towards the target. So I'm pushing

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further away or basically I'm kind of pushing horizontally in order to create

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that change and it's not that I've pushed harder it's just the direction has

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started to change. In addition I'm pushing with that lead foot as my

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center pressure starts shifting back towards that direction. So the furthest

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point it's going to be away from me is going to be more in here and then I

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start

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working towards the target. Now at the top of the swing you can see that the

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blue line from the right foot is pushing even more towards the target and the

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yellow line is changing that direction. So I'm going to be kind of shifting my

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pressure momentarily or when I start transition I'm going to be shifting all

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my pressure over towards that lead foot. But at the top of the swing I'm

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pushing

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with that trail foot and more of a horizontal direction. So I'm pushing away

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this way in order to get me going here. If we go through from early backswing

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until the top of the swing you can see that the amount I'm pushing doesn't

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change too much but the direction does and that directional change is what

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helps me create this rotation for the side bend. So now as I go into that early

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downswing you can see the right leg is no longer pushing nearly as much but the

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left leg and this total center pressure is shifted much more to the left. So by

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the time I got my left arm parallel I've shifted most of my pressure onto that

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front foot and you can see that it's all it's not just pushing straight down it

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's

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pushing towards the target a little bit way or a little bit as it's beginning

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to

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get into this bracing mechanic. Now as I get into the late downswing I'm

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pushing

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further and further back towards my body or basically I'm pushing more

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towards the target in order to help propel my arms and trigger the release.

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The right foot is not pushing very much and you can see that it's not really

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driving away from the target anymore. I already did that during transition. Now

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most of the push is going to come from that lead side and then when I get to

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impact I'm pushing further back or pushing towards the target to create this

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ground reaction pushing me further back and you can see that the right foot is

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actually going this way which means the foot is pushing against the ground that

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way. It's more dragging and kind of helping to kind of stabilize rather than

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actually driving. Most of the most of the drive of my legs is going to happen

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in

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the between these two frames and then by impact I better have all that energy

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out in the clubhead in order to transfer it to the golf ball. Again thank you

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Dr. Duffy and if you're a coach I highly recommend you look into his

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program to help you understand the science the golf swing even better. So

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hopefully looking at this visual has helped you visualize what the legs are

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doing with the ground and some of this ground reaction force stuff but

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essentially just walking through it you'll see that the golfer is gonna by this

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point is kind of really pushing so they basically stepped on to this right leg

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which a lot of good motion drills will get you to feel but they've stepped on

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this right leg and then I'm pushing against the ground this way and what

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happens is as I start going towards transition I start pushing more and more

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that way so you see that that blue arrow over the right foot as I get to kind

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of

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here I'm now pushing more that way instead of straight down as I am in the

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takeaway and then what you'll see is that lead foot is going to have the

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opposite pattern where I'm basically pushing kind of straight up this way by

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the time my arms are parallel or lead arm is parallel to the ground just like

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so and then as I go to push I'm pushing even a little bit more back as I now am

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transferring all that speed that I created down to the golf ball so I think

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this is a great way to kind of visualize some of that trail foot push and lead

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leg brace that I described hopefully it helps you build this little map in your

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mind of what it's supposed to look like and then I can use the drills to help

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build a feel which will strengthen what it should look like in your brain.

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Thanks

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again to Dr. Mike Duffy for letting us use this visual I think it's a great way

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of looking at how the feet are interacting with the ground.