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

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reaction force. So I want to thank Mike Duffy for letting me use the visual that he presented

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at the open forum. It's a great way of visualizing that it's not just about pushing

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more and pushing harder, it's more about pushing in the right direction with a combination

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of how hard you push. So we speak a lot about the direction that we need to push both

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with the trail foot and with the lead foot. Hopefully this visual helps you understand

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and kind of strengthen that visualization of what it is you're actually trying to do with

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your feet 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 of the Gulf of Marit Academy members.

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I'm going to walk you through basically what all these lines mean stuff like that. I'll

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put a key over on the side for you and keep it there. If you're a Gulf instructor, this

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is going to be invaluable. If you're a golfer, this is going to be great for you to be able

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to visualize and I'll try to keep it simple enough that you can practically apply it

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to your own game. If you are a Gulf instructor, I know that starting in the fall of 2015,

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Dr. Duffy is going to have a program that you can take to learn more about this kind of stuff

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and I highly recommend it. He's one of the bright minds out there. So let's get into looking

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at how all these things change during the Gulf swing. But first let's walk through each piece.

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So this little green orb in the middle is going to be his center of mass and then the blue

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lines are going to be how each foot is pushing against the ground or the ground reaction

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to how each foot is pushing against the ground. The yellow is the combination of those

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

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

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And the last little thing is this total frontal moment is basically showing the amount

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of rotational force or torque that I'm creating by pushing with my feet in a certain way.

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So as an example, if I were to change this and push with this left foot, you can see that

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would cause me to have a moment or a torque and make my body want to tilt over to the right.

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If I was to not push with the left at all, you could see that the combination is going

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

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So let's walk through the different phases of the swing and kind of take a look at

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how these things are changing. So here we have during the take away, you're going to push

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with that front foot slightly down and away in order to create some of this rotation to get

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onto that right side. Now at early backswing, I've shifted, you saw the yellow line shift to the

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right, so I've shifted my pressure over there and the blue line from the right foot is now pushing

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

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As we move up towards the late backswing when the arms parallel to the ground, you can see that

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the big difference is that the right foot blue line has shifted and pointed more towards the target.

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

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create that change and it's not that I've pushed harder, it's just the direction has started to change.

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In addition, I'm pushing with that lead foot as my center pressure starts shifting back towards

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that direction. So the furthest point is going to be away from me is going to be more in here and

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then I start working towards the target. Now at the top of the swing, you can see the blue line

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from the right foot is pushing even more towards the target and the yellow line is changing that

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direction. So I'm going to be kind of shifting my pressure momentarily or when I start transition,

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I'm going to be shifting all my pressure over towards that lead foot. But at the top of the swing,

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

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in order to get me going here. If we go through from early backswing until the top of the swing,

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you can see that the amount I'm pushing doesn't change too much, but the direction does.

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And that directional change is what helps me create this rotation for the side bend.

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So now as I go into that early downswing, you can see the right leg is no longer pushing nearly as

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much, but the left leg and the total center pressure is shifted much more to the left.

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So by the time I got my left arm parallel, I've shifted most of my pressure on to that front foot

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and you can see that it's not just pushing straight down, it's pushing towards the target a little

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bit way or a little bit as it's beginning to get into this bracing mechanic.

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Now as I get into the late downswing, I'm pushing further and further back towards my body or

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basically I'm pushing more 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 driving away from the

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target anymore. I already did that during transition. Now most of the push is going to come from that

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lead side. And then when I get to impact, I'm pushing further back or pushing towards the target to

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create this ground reaction pushing me further back. And you can see that the right foot is actually

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going this way, which means the foot is pushing against the ground that way. It's more dragging and kind of

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helping to kind of stabilize rather than actually driving. Most of the drive of my legs is going to

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happen in between these two frames and then by impact, I better have all that energy out in the club

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head in order to transfer it to the golf ball. Again, thank you Dr. Duffy and if you're a coach,

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I highly recommend you look into his program to help you understand the science of the golf swing

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even better. So hopefully looking at this visual has helped you visualize what the legs are doing

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with the ground and some of this ground reaction for stuff. But essentially just walking through it,

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you'll see that the golfer is going to buy this point is kind of really pushing. So they basically

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stepped onto this right leg, which a lot of good motion drills will get you to feel,

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but they've stepped on 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 that way. So you see that

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that blue arrow over the right foot as I get to kind of here, I'm now pushing more that way instead

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of straight down as I am in the takeaway. And then what you'll see is that lead foot is going to have

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the opposite pattern where I'm basically pushing kind of straight up this way by the time my arms

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are parallel or lead arm is parallel to the ground just like so. And then as I go to push,

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I'm pushing even a little bit more back as I now am transferring all that speed that I created

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down the golf ball. So I think this is a great way to kind of visualize some of that trail foot

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and lead like brace that I described. Hopefully it helps you build this little map in your mind

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of what it's supposed to look like and then I can use the drills to help build a feel which will

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strengthen what it should look like in your brain. Thanks again to Dr. Mike Duffy for letting us use this

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visual. I think it's a great way of looking at how the feet are interacting with the ground.