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What is ground force in the golf swing?

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There is no doubt about it, the guys and gals on tour have found something in the ground—and that something is power and speed. I’m sure by now you have heard of “ground reaction forces”—and I’m not talking about how you “shift your weight” during the golf swing.

Ground force in the golf swing: Pressure and force are not equal

With respect to ground force in the golf swing, it’s important to understand the difference between pressure and force. Pressure is your perception of how your weight is being balanced by the structure, in this case, the human body. Your body has a center of mass which is located roughly one inch behind the belt buckle for men and about one inch lower in women. When we shift (translate and/or torque) the center of mass, we create a pressure shift as the body has to “rebalance” the mass or body. This pressure shift can help us understand some aspects of the golf swing, but when it comes to producing power, force and torque are where it’s at.

Pressure can only be expressed in relation to the mass or weight of the body. Therefore, if you weigh 150 pounds, you can only create 150 pounds of pressure at one time. However, when we direct that mass at a larger object than our mass, all of a sudden that larger mass directs an opposite and equal reactionary force. So now, when a human being “pushes” their legs against the ground and “feels” 150 pounds of pressure, they now get 150 pounds of force directed back towards them from the ground, creating a total of 300 pounds of force that allows them to jump off the ground in this scenario.

If ground reaction forces don’t have anything to do with the “weight shift,” then what do they affect? Everything!

Most people use the same basic ingredients to make chocolate chip cookies. However, almost everyone has chocolate chip cookies that taste slightly different. Why is that? That is because people are variable and use the ingredients in different amounts and orders. When we create a golf swing, whether we are aware of it or not, we are using the same basic ingredients as everyone else: lateral force, vertical torque, and vertical force. We use these same three forces every time we move in space, and how much and when we use each force changes the outcome quite a bit.

Welcome to the world of 3D!

Understanding how to adjust the sequencing and magnitude of these forces is critical when it comes to truly owning and understand your golf swing. The good news is that most of our adjustments come before the swing and have to do with how we set up to the ball. For example, if an athlete is having a hard time controlling low point due to having too much lateral force in the golf swing (fats and thins), then we narrow up the stance width to reduce the amount of lateral force that can be produced in the swing. If an athlete is late with their vertical force, then we can square up the lead foot to promote the lead leg straightening sooner and causing the vertical force to happen sooner.

While we all will need to use the ground differently to play our best golf, two things need to happen to use the ground effectively. The forces have to exist in the correct kinetic sequence (lateral, vertical torque, vertical force), and the peaks of those forces need to be created within the correct windows (sequencing).

  • Lateral force – Peak occurs between top-of-swing and lead arm at 45 degrees
  • Vertical torque – Peak occurs between lead arm being 45 degrees and the lead arm being parallel to the ground.
  • Vertical force – Peak occurs between lead arm being parallel to the ground the club shaft being parallel to the ground.

While it may seem obvious, it’s important to remember ground reaction forces are invisible and can only be measured using force plates. With that said, their tends to be apprehension about discussing how we use the ground as most people do not have access to 3D dual force plates. However, using the screening process designed by Mike Adams, Terry Rowles, and the BioSwing Dynamics team, we can determine what the primary forces used for power production are and can align the body in a way to where the athlete can access his/her full potential and deliver the club to the ball in the most effective and efficient way based off their predispositions and anatomy.

In addition to gaining speed, we can help athletes create a better motion for their anatomy. As golfers continue to swing faster, it is imperative that they do so in a manner that doesn’t break down their body and cause injury. If the body is moving how it is designed, and the forces acting on the joints of the body are in the correct sequence and magnitude, not only do we know they are getting the most out of their swing, but we know that it will hold up and not cause an unforeseen injury down the road.

I truly believe that force plates and ground reaction forces will be as common as launch monitors in the near future. Essentially, a launch monitor measures the effect and the force plates measure the cause, so I believe we need both for the full picture. The force plate technology is still very expensive, and there is an educational barrier for people seeking to start measuring ground reaction forces and understanding how to change forces, magnitudes, and sequences, but I’m expecting a paradigm shift soon.

 

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Michael grew up working in the industry and always dreamed of becoming a PGA Professional. After a junior career that was highlighted with a few wins, Michael was briefly a member of the University of Louisville Golf Team before graduating from Eastern Kentucky University as a member of the inaugural class of the Professional Golf Management program. After doing everything in the industry on the green-grass side, Michael decided that he was truly passionate about teaching, and wanted to become the best instructor that he could be. Once Michael became a full-time instructor, it became crystal clear that he needed to expand his knowledge base to better help his students. Michael began by studying "The Golfing Machine" by Homer Kelley underneath the guidance of Scott Hayes. While TGM gave Michael a great understanding of the geometry and Kinematics of the golf swing, it still left questions that led Michael to purchasing his first set of Smart2Move 1D Force Plates. While learning about Ground Reaction Forces, Michael was introduced to Mike Adams and the rest of the BioSwing Dynamics team. Learning how to screen each athletes anatomy was a game changer for Michael and allowed him to understand what made each athlete different, and more importantly, how to coach each athlete to become the best they could. In addition to the network of BioSwing Dynamics coaches that Michael continues to work with, he has also completed the Scott Cowx Certified 5.5 program and uses that information to better understand wrist angle patterns and how those different patterns can be used to help players create a more consistent face angle. Michael continues to attend multiple educations every year and is always seeking to refine his information base. In addition to working with athletes of all abilities, Michael also mentors several of his fellow PGA Professional coaches. | Podcast on Apple | Podcast on Spotify | MichaelDutro.com | Measured Golf

12 Comments

12 Comments

  1. geohogan

    Mar 28, 2021 at 2:44 pm

    Clubhead speed comes from momentum created by a pivot and COAM, (conservation of angular momentum)

    As Frank stated above, attempting to create speed from the lower body will only result in injury to knees and the spine. Byron Nelson and the other great swingers, used the lower body(flexed knees) to support their pivot and maintain balance, not to create force.

  2. Greg McNeill

    Mar 8, 2021 at 1:28 pm

    I’ve always found this explanation to be helpful: https://www.youtube.com/watch?v=qQVFhqAKcMg

  3. geohogan

    Mar 7, 2021 at 10:52 am

    https://en.wikipedia.org/wiki/Ground_reaction_force

    Our movements(golf swing) are dependent upon Newtons Laws, always have been.

  4. Head Spinning

    Mar 7, 2021 at 7:38 am

    Michael, nothing Michael personal. But Michael can you Michael redo your Michael bio and not Michael talk about Michael yourself in Michael the third Michael person?

  5. Robert Johansson

    Mar 7, 2021 at 6:37 am

    Only one guy understand the golf swing in the world
    Soon you will to once my stuff is out there

    • Frank

      Mar 7, 2021 at 11:47 pm

      Ground force training AKA back and knee surgery at 40. You think Byron Nelson knees flexing well into his followthrough created much ground force? Probably not but it sure helped him get 68.33 scoring average with a 67.65 final round average, the latter which is still a record today. All this knee straightening that Rory and Justin Thomas do to get more ground force and distance is so bad for the body…

  6. Johnny Rocket

    Mar 7, 2021 at 4:19 am

    Is this a joke?

  7. Mianni Gagliocco

    Mar 7, 2021 at 1:17 am

    And here I thought ground force was how high my ball bounced off the concrete in the parking lot on a wayward chip.

  8. Bud

    Mar 6, 2021 at 10:06 pm

    Huh?

  9. The Dudeness Dude

    Mar 6, 2021 at 8:48 pm

    Average Person: Golf is so complicated !!!

    Michael Dutro: Hold my beer, you ain’t seen NOTHING yet!!!

    • Ferry Bueller

      Mar 6, 2021 at 8:50 pm

      The one “like” is from Michael and the two “Legits” must be from friends and family members !!!

    • Livininparadise

      Mar 9, 2021 at 2:25 pm

      I hope thar everyone that I play with tries this. I will be buying a bunch of bitcoin by midway through the season. This is not a great explanation and even worse advice.

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Clement: This wrist position can add 30 yards to your drive

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Drop the mic on how the wrists should load and be positioned for compressive power, accuracy, and longevity! There is a better way, and this is it!

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Short Game University: How to hit wedges 301

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In golf, there is nothing harder than judging a flop shot over a bunker to a tight pin out of long grass. Why? Because there are so many variables to account for — in addition to what you can and cannot do with a wedge. In fact, up until very recently in the world of wedge design, we were limited to only increasing the landing angle to stop the ball, because relying on spin from this lie and this close to the green was next to impossible.

Now with the advent of things like raw faces, different CG locations, new groove design, and micro-ribs between the grooves, we can now spin the ball out of lies that we never could have done so before. This is not to say that you can now zip the ball back from these types of lies, but we are seeing spin rates that have skyrocketed, and this allows us to not open the face as much as we needed to do before in order to stop the ball.

Before we get into the shot around the green itself, let’s talk a bit about wedge design. For that, I called a great friend of mine, Greg Cesario, TaylorMade’s Staff Manager to help us understand a bit more about wedges. Greg was a former PGA Tour Player and had a big hand in designing the new Milled Grind 3 Wedges.

Cesario said: “Wedge technology centers on two key areas- the first is optimizing its overall launch/spin (just like drivers) on all shots and the second is optimum ground interaction through the geometry of the sole (bounce, sole width, and sole shape).”

“Two key things impact spin: Groove design and face texture. Spin is the secondary effect of friction. This friction essentially helps the ball stick to the face a little longer and reduces slippage. We define slippage as how much the ball slides up the face at impact. That happens more when it’s wet outside during those early morning tee times, out of thicker lies, or after a bit of weather hits. Our Raised Micro-Ribs increase friction and reduce slippage on short partial shots around the round – that’s particularly true in wet conditions.”

“We’ve been experimenting with ways to find optimal CG (center of gravity) placement and how new geometries can influence that. We know that CG locations can influence launch, trajectory and spin. Everyone is chasing the ability to produce lower launching and higher spinning wedge shots to help players increase precision distance control. In that space, moving CG just a few millimeters can have big results. Beyond that, we’re continuing to advance our spin and friction capabilities – aiming to reduce the decay of spin from dry to fluffy, or wet conditions.”

Basically, what Greg is saying is that without improvements in design, we would never be able to spin the ball like we would normally when it’s dry and the lie is perfect. So, with this new design in a wedge like the Milled Grind 3 (and others!), how can we make sure we have the optimal opportunity to hit these faster-stopping pitch shots?

  1. Make sure the face is clean and dry
  2. Open the blade slightly, but not too much
  3. Set the wrists quicker on the backswing to increase the AoA
  4. Keep the rear shoulder moving through impact to keep the arms going

Make sure the face is clean and dry

If your thought is to use spin to stop the ball quicker under any situation, then you must give the club a chance to do its job. When the grooves are full of dirt and grass and the remaining exposed face is wet, then you are basically eliminating any opportunity to create spin. In fact, if you decide to hit the shot under these conditions, you might as well hit a flop shot as this would be the only opportunity to create a successful outcome. Don’t put yourself behind the eight-ball automatically, keep your club in a clean and dry condition so you have the best chance to do what you are capable of doing.

Open the blade slightly, but not too much

Without going into too much extra detail, spinloft is the difference between your angle of attack and your dynamic loft. And this difference is one of the main areas where you can maximize your spin output.

Too little or too much spinloft and you will not be able to get the maximum spin out of the shot at hand. With wedges, people equate an open clubface to spinning the ball, and this can be a problem due to excessive spinloft. Whenever you have too much dynamic loft, the ball will slide up the face (reduced friction equals reduced spin) and the ball will float out higher than expected and roll out upon landing.

My thought around the green is to open the face slightly, but not all the way, in efforts to reduce the probability of having too much spinloft during impact. Don’t forget under this scenario we are relying on additional spin to stop the ball. If you are using increased landing angle to stop the ball, then you would obviously not worry about increasing spinloft! Make sure you have these clear in your mind before you decide how much to open the blade.

Opened slightly

Opened too much

One final note: Please make sure you understand what bounce option you need for the type of conditions you normally play. Your professional can help you but I would say that more bounce is better than less bounce for the average player. You can find the bounce listed on the wedge itself. It will range between 4-14, with the mid-range bounce being around 10 degrees.

Set the wrists quicker on the backswing to increase the angle of attack

As we know, when debris gets in between the clubface and the ball (such as dirt/grass), you will have two problems. One, you will not be able to control the ball as much. Secondly, you will not be able to spin the ball as much due to the loss of friction.

So, what is the key to counteract this problem? Increasing the angle of attack by setting the wrists quicker on the backswing. Making your downswing look more like a V rather than a U allows less junk to get between the club and the ball. We are not using the bounce on this type of shot, we are using the leading edge to slice through the rough en route to the ball. Coming in too shallow is a huge problem with this shot, because you will tend to hit it high on the face reducing control.

Use your increased AoA on all of your crappy lies, and you will have a much better chance to get up and down more often!

Keep the rear shoulder moving through impact to keep the arms going

The final piece of the puzzle through the ball is speed through the pivot. You cannot hit shots around the green out of tall grass without keeping the club moving and having speed. A reduction of speed is obvious as the club enters into the tall grass, but you don’t want to exacerbate this problem by cutting off your pivot and letting the arms do all the work.

Sure, there are times when you want to cut off the body rotation through the ball, but not on the shot I am discussing here. When we are using spin, you must have speed to generate the spin itself. So, what is the key to maintaining your speed? Keeping the rear shoulder rotating long into the forward swing. If you do this, you will find that your arms, hands, and club will be pulled through the impact zone. If your pivot stalls, then your speed will decrease and your shots will suffer.

Hopefully, by now you understand how to create better shots around the green using the new wedge technology to create more spin with lies that we had no chance to do so before. Remembering these simple tips — coupled with your clean and dry wedge — will give you the best opportunity to be Tiger-like around the greens!

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