Ground Reaction Forces & Clubhead Speed: 5 Studies

August 20, 2026

Ground reaction forces are not a minor detail in the golf swing. A 2026 study published in Frontiers in Sports and Active Living found that foot-ground interaction variables, combined with impulse-based energy transfer, explained 75.4% of the variance in clubhead speed across a sample of 30 golfers. [1] If you are working on adding distance and you have not looked at what your feet are doing on video, you are missing most of the picture.

What Ground Reaction Forces Actually Do During the Swing

The kinetic chain concept describes how energy originates at the ground and travels upward through the legs, hips, torso, arms, and finally into the club. [1] This is not metaphorical. When you push into the ground during the downswing, you are generating a measurable reaction force that drives rotation in the hips and torso. The club moves fast because the body sequences those forces correctly, not because the arms swing harder.

A 2019 Sports Biomechanics study by Han et al. from the Biomechanics Laboratory at Texas Woman's University examined this in 63 highly skilled male golfers, all with handicaps of 3 or lower. [2] The researchers measured ground reaction forces and three types of golfer-ground interaction moments using an optical motion capture system and dual force plates across three club conditions: driver, 5-iron, and pitching wedge. [2] They found that the GRF moment about the forward/backward axis and the pivoting moment about the vertical axis were the primary mechanical contributors to clubhead speed. [2] The lead foot backward force showed the strongest single correlation with clubhead speed (r = 0.55) when using a pitching wedge. [3]

One thing worth noting: the Han et al. study used only skilled golfers (handicap ≤ 3), and all were male. How well these specific correlations translate to mid- and high-handicap players, or to female golfers, is an open question in the literature. The directionality of the relationship, meaning that better ground interaction associates with more clubhead speed, is broadly consistent, but the magnitude of individual correlations varies across studies. [3]

Five Studies That Define What We Know

Study 1: Frontiers in Sports and Active Living (2026)
The most mechanistically detailed work on this topic to date. Thirty right-handed golfers, split evenly between professionals and high-level amateurs, performed maximal driver and 7-iron swings while researchers recorded kinematics, ground reaction forces, and plantar pressure. [1] Foot-ground interaction variables alone explained 35.5% of clubhead speed variance. Adding trunk sequencing and impulse-based energy transfer efficiency raised that figure to 75.4%. [1] Critically, mediation analysis showed that early-phase centre-of-pressure behaviour did not directly influence clubhead speed. The effect ran through impulse-based energy transfer efficiency, accounting for 55% of the variance in the mediation model. [1] The conclusion: foot-ground interaction enhances clubhead speed primarily by facilitating efficient impulse-based energy transfer along the kinetic chain, not through direct mechanical effects. [1]

Study 2: Han et al., Sports Biomechanics (2019)
As noted above, this study of 63 skilled male golfers across three club types showed that golfer-ground interaction moments, particularly pivoting torque about the vertical axis and forward/backward axis moments, are the primary kinetic contributors to maximum clubhead speed. [2] The loading onto the lead foot was identified as critical near the moment of maximum angular effort, specifically when the lead arm becomes parallel to the ground. [2]

Study 3: Watson et al., Sports Medicine Systematic Review (2026)
This PRISMA-compliant systematic review from Middlesex University and The R&A included 24 studies and represented the most current synthesis of GRF and centre-of-pressure research in golf. [3] Nine empirical investigations showed moderate-to-strong relationships between either centre-of-pressure and clubhead speed, or GRF and clubhead speed. More skilled golfers consistently demonstrated higher GRF and superior clubhead speed than less skilled golfers. [3] The review concluded that changes in both centre-of-pressure and GRF represent important factors which contribute to superior golf performance, as defined by increases in clubhead speed or reduced handicaps. [3] The authors also noted that variability in findings across studies stems from differences in skill levels, swing variability, coaching history, experimental methods, and sample sizes, which is an important caveat for applying any single study's numbers to your own game. [3]

Study 4: McHugh et al., Journal of Strength and Conditioning Research (2024)
This study collected kinematic and kinetic data from 33 male golfers categorized as proficient, average, or unskilled, using a driver with high-speed motion analysis and dual force plates. [4] A combination of just five metrics, including peak lead foot GRF as the lone kinetic variable, explained 85% of the variability in ball velocity. [4] Unskilled golfers took measurably longer to reach peak lead foot GRF compared to both average and proficient golfers, which suggests timing of ground force application is at least as important as the magnitude of force generated. [4] The Watson et al. systematic review also highlighted this study, noting that ball speed and driving distance variance from the lead foot's peak GRF reached R² = 0.85 and R² = 0.74 respectively. [3]

Study 5: Chu, Sell, and Lephart, Journal of Sports Sciences (2010)
This earlier but widely cited study from the University of Pittsburgh analysed swing kinematic and ground reaction force data from 308 golfers, one of the largest samples in the golf biomechanics literature. [5] Regression models applied at four swing events accounted for 44 to 74% of variance in ball velocity, with upper torso-pelvis separation, delayed release of the arms and wrists, trunk tilting, and weight-shifting all identified as significant predictors. [5] Weight-shifting is the ground-up component in that list. The study's value is its scale: 308 participants produces considerably more generalizable findings than most lab studies, though it is worth noting the sample was not stratified by sex or competitive level in ways that always translate cleanly to recreational golfers.

The Practical Problem: You Cannot Measure GRF on a Course

Force plates, the standard tool for measuring GRF, require a laboratory setup. [6] You are not going to install one on the 14th tee. Wearable IMU research is advancing but has not yet reached the accuracy needed for individual coaching at the consumer level. [6] This leaves video as the most accessible tool a golfer has for reviewing foot position, weight transfer timing, and lower body mechanics during actual rounds and practice sessions.

Here is where the practical gap shows up. Based on what golfers in communities like r/golf frequently discuss, most people who record their swings do so by propping a phone against a bag or asking a playing partner to hold it. Neither approach gives you a consistent camera angle shot to shot, and neither is available when you are playing alone. The research on video feedback for golf instruction suggests video analysis is an effective means of practice, though the positive effects may take time to develop and are more pronounced in skilled performers. [7] The prerequisite is that you can actually capture usable footage consistently.

A stable, repeatable camera position is something you can solve with a magnetic phone mount on your golf cart. The BLAUBECK Alloy Magnetic Golf Cart Phone Holder attaches to iron or steel surfaces on Club Car, EZGO, Yamaha, and all major golf cart frames using industrial-strength N54 neodymium magnets with a silicone base that protects the cart finish. There are no clamps, no drilling, and no adhesive involved. MagSafe iPhones attach directly through most cases; Android and non-MagSafe phones use an included metal ring. Once mounted, you set your angle once and it holds through the bumps and vibration of cart travel between shots. By the time you reach your ball, your phone is ready to record from a consistent position, hole after hole. That matters when you are trying to track whether weight transfer timing is actually improving across a round. You can view the holder at blaubeck.com.

One honest limitation to flag: the holder requires an accessible steel or iron mounting point on your cart. If your cart has plastic panels in the areas you would prefer to mount, you will need to identify a compatible metal surface first.

What Video Analysis Can and Cannot Tell You About Your Footwork

Video cannot measure force in newtons. It cannot tell you that your lead foot GRF peaked 40 milliseconds too late. What it can show you is whether your heel rises prematurely, whether your trail foot stays planted through impact when it should be pushing off, and whether your weight visibly shifts toward the lead side during the downswing. Those are the observable proxies for what the force plate studies are measuring.

The Nesbit three-dimensional kinematic and kinetic study of 85 amateur golfers of varying skill levels established that the golf swing is a highly coordinated and individual motion, with subject-to-subject variation being significant. [8] That individuality matters when you are interpreting your own footage. Do not compare your footwork frame-by-frame to a tour player without accounting for differences in flexibility, body composition, and swing style. What you are looking for is internal consistency: does your lower body sequence the same way on your best contact shots compared to your mishits? That is a question video can answer, and it is a question worth asking given how much of clubhead speed variance traces back to ground interaction.

The 2026 Frontiers study suggested that high-priority next steps for this research area include the development of real-time, sensor-based feedback tools for on-course performance monitoring. [1] Until those tools are consumer-ready and affordable, on-course video from a stable angle is still the most accessible feedback mechanism most golfers have access to.

A Practical Framework for Using This Research

The research collectively points to a few things any golfer can work with:

Lead foot loading during the downswing is one of the strongest single predictors of ball speed, across multiple studies and sample sizes. Focus on whether you can feel and see your weight arriving on the lead side early and deliberately.
Timing matters as much as magnitude. McHugh et al. found that unskilled golfers took longer to reach peak lead foot GRF, not necessarily that they generated less peak force. [4] If your weight shift is late, speed is being left behind regardless of how hard you are trying to swing.
Centre-of-pressure path does not directly drive clubhead speed. The Frontiers study showed that the effect runs through energy transfer efficiency, not through CoP displacement alone. [1] Moving your weight without sequencing it efficiently into the kinetic chain does not reliably add distance.
Skilled golfers show reduced variability in their ground interaction strategy compared to less skilled golfers. [3] Consistency of foot mechanics, not just peak output, is a meaningful marker of improvement.

To use any of these insights, you need footage. Specifically, you need footage from a stable angle that captures your full lower body. A face-on view showing both feet from address through follow-through is the most informative starting point. Record it during actual rounds, not just range sessions, because on-course situations introduce terrain variables and time pressure that change how you move. If the research is clear about anything, it is that the ground interaction is where speed originates, and capturing it on video is the lowest-friction way to start understanding your own pattern.

If this research has you looking more carefully at your footwork, the BLAUBECK Alloy Magnetic Golf Cart Phone Holder is a straightforward way to keep your phone in a fixed, adjustable position on the cart so you can capture consistent footage without setting up a tripod or relying on a playing partner every shot. The N54 neodymium magnets hold securely through rough terrain, the 360-degree adjustable head lets you dial in your preferred angle, and the silicone base means no damage to your cart's finish.

References

Frequently Asked Questions

What is a ground reaction force in the golf swing?

A ground reaction force is the force the ground exerts back against your feet in response to the force your feet exert on the ground. During the downswing, skilled golfers actively push into and across the ground to generate rotational torque in the hips and trunk. This force travels upward through the kinetic chain to the club. Multiple peer-reviewed studies have identified it as one of the strongest predictors of clubhead speed, with the lead foot's peak GRF showing particularly strong associations with ball velocity and driving distance.

Can I improve my ground reaction forces without a force plate?

You cannot measure ground reaction forces precisely without force plate equipment, which is confined to laboratory settings. However, you can develop more efficient ground interaction through targeted training, including hip strength, rotational power work, and deliberate footwork drills. Video from a stable, consistent angle is the most accessible on-course tool for reviewing weight transfer timing and lead foot loading patterns, which are the visible proxies for what force plates measure.

What camera angle is best for analysing golf swing footwork?

A face-on view, positioned directly in front of the golfer at approximately hip height, is the most informative angle for reviewing lower body mechanics, including lead foot loading, heel lift, and overall weight transfer direction. A down-the-line view from behind complements this by showing hip and shoulder rotation sequencing. Research on mobile swing analysis systems has found that side-view recordings produce lower pose-estimation error than front-view recordings, so combining both angles gives the most complete picture when possible.

Does the type of club change how ground reaction forces affect clubhead speed?

Yes. The Han et al. study found that GRF correlations with clubhead speed differed across driver, 5-iron, and pitching wedge conditions. The lead foot backward force correlation was actually strongest with the pitching wedge (r = 0.55) in that study, which challenges the assumption that ground interaction only matters for driver distance. The broader principle, that efficient foot-ground force application supports clubhead speed across all clubs, is consistently supported in the literature, though the specific magnitudes and directions of force involved vary by club type and individual swing.

Recommended: Alloy Magnetic Golf Cart Phone Holder