Justin Thomas - Left Leg Stability and Power

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In this video, Justin Thomas shows you how to use your left leg for a better backswing and a more powerful downswing.

  • Keep the left knee pointed out side the ball in the backswing. 
  • Shift into the left side to start the downswing and stabilize. 
  • Post up by driving the lead heel into the ground and clearing the hips. 


Hey, what's up, guys? This is RST instructor Chris Tyler, and we are back with this week's tour analysis with Justin Thomas, who just picked up a victory on the PGA Tour this past weekend, a one-shot victory over Adam Scott, so congratulations to Justin.

This week, We are going to be focusing in on how to use your left leg for stability in your backswing and how to use it for power in your downswing.

So if you've been looking for a more consistent, more stable golf swing, then you want to pay close attention to today's review.

Okay, guys, so as I said in the opener, We are going to be focusing in on how to use your left leg or your lead leg in your golf swing if you are a left-handed golfer.

We're going to focus on how to use that as a source of stability in your backswing, and how to use it as a source of power in your downswing.

So if you've been noticing that, your golf swing is getting a little bit longer and more out of control.

And you want to develop a lot more consistency, and you want to be able to develop some good power in your midsection, Then we're going to use the left leg in your golf swing as a way to stabilize it, going back and help you give that separation.

What I mean there is, let's go ahead and just look at the position of his left knee at the starting point here.

I'm going to go ahead and mark it straight down here so you can see.

Okay, so it would be just inside of neutral joint alignment here.

Go to a little bit wider of a base when we have a driver's swing.

Okay, And then you're going to see as he works up to the top of his golf swing, loading into his right side here, you're going to see that the knee has moved a little bit.

It hasn't moved a ton, maybe two, two and a half inches or so.

But the big issue that we see with a lot of amateur golfers, and this kind of stems back to a lot of the older style golf swings where things were very, very linky and very free-flowing, is that we would see this left knee really start to dive down and in here.

And what that does is it allows the hips to have more mobility.

It allows your hips, when your hips have more mobility, then your torso can continue to rotate.

When your torso can continue to rotate, now your hands and arms can go much longer.

And it's also not allowing you to create that separation between the hip line and shoulder line, and not allowing you to really feel a lot of engagement in your midsection, which is really critical for power and for speed.

So, if you've noticed that your left knee dives way down and in, work on trying to keep your left knee pointed outside the golf ball.

Yeah, it's okay to have some mobility in it, but in turn, what you're going to see is you're going to feel like your golf swing is really shortened up, really tightened up, and you're still hitting the golf ball just as far, which is great news.

And Justin is a freak of nature when he actually pounds a golf ball, has one of the highest launches on the PGA Tour, Has an absolutely incredible smash factor as far as the way he strikes his golf ball with his driver.

And that's the reason why, at 145 pounds, he just pounds it off the tee.

So without further ado, let's just keep looking at what he does now with the lead knee.

So this first line here was the starting point of where the knee was.

Second line right here is where the knee is at the top of the swing.

And you're going to see, as he starts the downward move here, You're going to see that external rotation of the lead leg and a good fair amount of trail side help here.

You can actually see that his right foot is up off the ground here quite a bit.

But now that he's gotten his lead knee over into neutral joint alignment here, where the center of the lead knee is right on top of the center of the ankle, I want you to pay very, very close attention to this because this is where he's going to start to use his legs.

His lead leg is a very big source for leverage from the ground.

I'm going to go ahead and mark his head position here.

So mark the top of his head.

And let's go ahead and work through these frames here.

So you can see that lead foot is very, very stable on the ground, nice and flat, not rolled to the outside part.

Now watch this.

You're going to see that his lead foot comes up off the ground.

Let me get through a couple more frames.

So now you see that that lead foot is way up off the ground.

So now what he's done is he's, now that he's gotten his weight transferred into his lead side, he has stabilized it.

And then he's used it as a source of power by properly pushing it into the ground.

And then clearing it with his lead side obliques.

Now the one other thing that I wanted to mention here is the head position.

You didn't see his head moving up as his left leg is moved to this straight position.

So if you've noticed on camera, when you're looking at your golf swing from a face on perspective, that your head is moving vertically, Then chances are you're using too much of your right side down in the hitting area, and you're bringing your hips forward.

And then causing some early extension from the spine.

Which can then in turn make it very hard to hit the golf ball solidly.

So what I would suggest is don't try to get so much leverage from the ground at that point.

Work on just working to maintain your posture.

Keep your hips back.

And then once you get more control of it, then slowly start to ramp your speed up.

Slowly start to add more ground leverage.

And you'll be out there pounding the golf ball further than you ever have.

It's really important for swing speed is being able to use your legs.

Okay guys, so that's this week's review.

So if you've been struggling with backswing stuff and getting a little bit longer and out of control, keep that lead leg a little bit more pointed outside the golf ball.

And if you've been looking for a way to move that left leg to a straight position, we've got a great video on the website called the Straight Left Legged Impact.

We also have the Left Knee Laser Beam Drill and we also have the Roll of the Right Foot.

That's another video, you're going to hear me really kind of drive home with you guys.

To make sure that we understand how we can use that as a break to our bodies in the golf swing.

So check those videos out and let's get out there and play some of your best golf and make it a great day.

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64x64
William
Good information on the left leg and right foot. My question concerns the left foot. Does RST have a preference where the weight should be at impact? Should it be on the inside, center or outside of the left foot or does it matter if everything else is correct?
October 11, 2019
64x64
Craig (Certified RST Instructor)
Hello William. Preferably the center of the ankle joint.
October 11, 2019
64x64
William
That would seem to provide the most stable position as well as the safest to not injure your ankle long term. It's just when I watch the pros they quite often have rolled onto the outside of their foot.
October 11, 2019
64x64
Craig (Certified RST Instructor)
Hello William. True. They tend to get a little outside because of the aggressive nature of their hips. But, I want you to be safe. Just cause a tour pro does it doesn't make it correct .
October 11, 2019
64x64
Mehul
i can't find the straight left leg at impact video. can u help me locate it please? thanks
August 24, 2019
64x64
Craig (Certified RST Instructor)
Hello M. That video was replaced with You Hit the Golf Ball with Your Legs Video. I apologize for the confusion.
August 25, 2019
64x64
Stephen
I notice that JT’s left heel is off the ground at impact implying that when he shifted his weight to the left he did it by applying pressure into the ground through the balls of his feet. I thought the RST approach was to load up the right side by digging the right heel into the ground/loading up the right glute and then shift your weight by doing the opposite with the left heel/left glute.....What is the right the right method to shift weight...through the left heel or through balls of the left foot? Thanks
January 23, 2019
64x64
Craig (Certified RST Instructor)
Hello Stephen. Through the heel. JT reaches the lift off position at impact because he is so aggressive with his hips (You Hit the Golf Ball with Your Legs Video). It can produce more club head speed, but at a cost. It puts tons of wear and tear on your lead knee. For ex: Tiger in the 2008 US Open why he start having lead leg issues.
January 23, 2019
64x64
Brandon
With a lot of trail side help (not necessarily trail side push) how does he strike the ball consistently and where does he get leverage from to get through the ball? It seems like he's very good at maintaining his posture and leveraging the ground for power.
September 9, 2016
64x64
Craig (Certified RST Instructor)
Hello Brandon. You don't have to have a massive squat for leverage pull. A little can still go a long way. He does spin his hips a little more for power than some RST Swingers. He releases the club well with his head staying down. The posture retention and release helps his consistency.
September 10, 2016
64x64
Brandon
Also it looks like Justin does a good job with his lead side to pull through the ball.
November 7, 2016
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Anthony
Chris, it looks like when he straightens his left leg in the downswing this move provides his secondary axis tilt and also lowers his right shoulder and keeps the right shoulder in place, stalls the body and also keeps his head down and back. Am I looking at this correctly? Thanks
December 2, 2015
64x64
Craig (Certified RST Instructor)
Hello Anthony. The good post up from the lead leg is helping him pull leverage from the ground. This move combined with the release is helping him stall the body. It increases his tilt a bit, but that is more linked to the forward ball position, maximizing launch angle, good release and trying to slingshot the ball.
December 2, 2015
64x64
Loran
Should I work on posting my upper body to the left side on the downswing?...instead of relying on the left hip joint and straightening of the leg? This type of movement creates the "c" body shape and is detrimental to the hips.
November 28, 2015
64x64
Craig (Certified RST Instructor)
Hello Loan. If you are creating a "C" shape then the weight with your upper half is falling backwards and you are not getting stacked. Level Shoulders Drill, Face On Impact Alignment and LADD Video will help.
November 28, 2015
64x64
Nacho
Thank u very much Chris and please excuse my ignorance and my writing. I guess I'm the only Spaniard in this chat
November 2, 2015
64x64
Chris (Certified RST Instructor)
hahaha no worries at all. We will make it more clear in some future videos.
November 2, 2015
64x64
Nacho
Hi Chris, would u be kind enough to explain in more detail the external rotation of the lead femur during the downswing. I think this move is one of the keys to make a correct transition. Thank you v much!
November 2, 2015
64x64
Chris (Certified RST Instructor)
Hey Nacho, the correct anatomic terminology is internal femur rotation of the lead side. At RST, we tend to use the term external lead leg rotation and I am currently working on a video that will help clarify this.
November 2, 2015
64x64
Lee
November 9, 2015

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