WEBVTT

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in this golf smart insight we're gonna

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talk about going normal so so first

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let's define what normal is and that's

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actually fairly tricky because there are

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a couple different ways that you can

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define going normal depending on your

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reference point a normal force is

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essentially a force that's perpendicular

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so in in physics class we always had you

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would start with the equation with

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gravity is going straight down and

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normal force is going straight back up

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at gravity because they're perpendicular

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to each other so the normal force when

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I'm swinging something we can go back to

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head cover swing so if I was to swing

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this object like so essentially what

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will happen is I'm gonna give it a

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little bit of a linear force to kind of

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get it going and then boom I'm gonna get

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into a normal force like so which is

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basically I'm gonna be pulling away from

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the direction that it's rotating and

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that's gonna cause so I'm it's going

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this way because I'm pulling this way

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that's essentially a normal force

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because I'm pulling away from where the

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mass is kind of going out away from me

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okay so how does that apply to the golf

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swing well there's a couple different

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ways that you could define your normal

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force you could define the normal force

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just based on the instantaneous axis

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that the club is swinging around or you

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could define the normal force dependent

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on your body now because of how I look

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at 3d and tend to talk about the golf

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swing I tend to defer more towards

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defining it based on a global scale or

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looking at your body so in the global

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scale a normal force is going to be dead

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up this longitudinal axis so when the

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force is coming straight back towards

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towards me from the shaft the force is

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normal anytime that there is a

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difference between where the forces and

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where the shaft is it would not

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technically be normal it could be going

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normal it could be going away from

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normal but it would not technically be

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normal we're in the instantaneous access

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method basically if the force is not

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going in the direction of the target it

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could be considered normal which there

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was a famous paper by Nesbit and I

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believe he used that method for

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calculating normal force so when I'm

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talking about normal

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what I'm typically referring to is the

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point where everything is kind of being

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pulled out and the force is going

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straight up and down that shaft so at

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that point you're basically going to

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have you've maxed out your ulnar

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deviation you've maxed out your elbow

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extension in our particular case you've

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had some form of rotation to help get

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that even further away from you but

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basically the grip is as far away from

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your body as you can get it and it's not

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possible to have that point the at

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impact and further out at the same time

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so at impact if you were to look at it

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now and if you look at what Sasha and

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McKenzie presented

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there's definitely kind of these

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competing forces that are hopefully

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trying to somewhat balance out so that

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the force is coming somewhere back up

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towards me but it's not completely

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normal if you're using the body as the

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reference point until it gets out in

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this position you feel kind of that

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little bit of a tug now the normal force

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is frequently described as a pulling

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motion and as you saw with the head

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cover swings that makes a lot of sense

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but for some golfers feeling like it's

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pulling motion may not make the most

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sense so here would be the analogy if

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you were doing a pull-up so imagine you

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got a bar above you and you grab it

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you're going to pull yourself up and

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then you're gonna pull yourself down if

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that makes sense to you then yes this is

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going to be a pulling motion because

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essentially what's gonna happen is in

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this pull up I'm gonna use the muscles

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in my back and my shoulders to pull

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myself up and then those same muscles

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are going to be acting while they're

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lengthening or doing what's called an

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eccentric eccentric contraction to lower

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something myself down but the force is

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going through my body are the same

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muscles that pull and so if you were to

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measure them they would still be working

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away from me in a pull direction it's

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kind of what's happening here is when I

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go through and as I'm working towards

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normal the club is moving away from me

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and my elbows are straightening so all

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these things are lengthening out as my

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body works slightly backward so I'm

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pulling even though it's going away from

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me

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so that's where I think some of the

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confusion

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as far as the application of how to go

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normal can happen the the majority of

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the normal force should happen from the

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legs pushing the upper body back and

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away as your arms release and that

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creates this tug on the club what a lot

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of amateurs do is they get to kind of

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this point of no return where you've got

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no access still and be coming in very

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very steep and so they will pull their

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arms in and create the normal force this

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way every golfer virtually every golfer

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I've ever looked at creates a normal

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force down near impact it's just a

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matter of how they do it which is going

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to dictate how much success they're

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gonna have what their swing I think that

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should help clarify what I mean when I'm

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discussing going normal I know that

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everybody else can have different

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definitions depending on their

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perspective I just want to clarify mine