Ask any group of recreational golfers what they need to train to hit the ball further, and most will say the same thing: the core. Rotate more, brace harder, get a stronger midsection. It is advice that sounds reasonable, and it is repeated constantly in golf fitness content. There is just one problem. The research does not support it.
The legs are where the power in your golf swing actually comes from. Not the arms, not the core, and not your shoulder turn. The legs. And for golfers over 45 who are losing distance year over year, this distinction matters enormously, because it points directly to the training change that will actually move the needle.
What the Research Says
A 2014 study published in the International Journal of Sports Medicine measured the mechanical work produced at every joint in the body during the golf downswing in experienced golfers. The researchers found that lower extremity work was the strongest single predictor of clubhead velocity. The lead leg in particular — the left leg for a right-handed golfer — showed the strongest relationship with clubhead speed of any variable they measured. The conclusion was direct: lower extremity muscle strength is a primary factor in clubhead speed, and improved clubhead speed directly affects distance.
This is not an isolated finding. A 2021 systematic review published in the European Journal of Sport Science analyzed correlations between physical attributes and clubhead speed across dozens of studies. Lower body strength and power consistently ranked among the strongest predictors of clubhead speed, often outperforming measures of core strength and rotational flexibility.
The reason comes down to how the swing actually works. Power in the golf swing is generated from the ground up. The legs push into the ground, the ground pushes back, and that force travels up through the hips and torso before being transferred into the arms and club. The core does play a role in this chain, but it is a transfer mechanism, not a generator. If the legs are not producing enough force to begin with, there is nothing for the core to transfer. Training the core without training the legs is like upgrading the transmission in a car with a weak engine.
Why Just Playing Golf Does Not Fix This
Walking the course and swinging a club repeatedly does not develop leg strength. Golf is a low-load, high-skill activity. The forces involved in walking 18 holes are not sufficient to stimulate the neuromuscular adaptations that increase strength and power output. Your body adapts to the demands placed on it, and the demand of walking on flat ground simply does not challenge the legs enough to produce meaningful strength gains.
This is why golfers who play three or four times a week for years can still lose distance as they age. They are practicing the skill of golf, but they are not training the physical quality that drives distance. Those are two different things, and only one of them requires a gym.
The Training That Actually Works
The good news is that you do not need to spend hours in the gym to see results. An 8-week study by Oranchuk and colleagues, published in the Journal of Strength and Conditioning Research in 2020, found that golfers who trained three days per week using high-load lower body movements saw a statistically significant 3.2% increase in clubhead speed compared to a control group. The exercises were straightforward: back squats, deadlifts, and power-based movements. Three sessions per week, with at least one rest day between each.
The key detail in that study, and in the broader strength training literature, is the rep range. The participants trained for strength, not endurance. That means sets of 5 to 8 repetitions with a load that is genuinely challenging, not 20 to 25 reps with a light weight. High-rep training builds muscular endurance. It does not build the kind of strength and power that translates to clubhead speed. If you are doing three sets of 20 goblet squats with a 20-pound kettlebell, you are conditioning your legs, not strengthening them. The stimulus needs to be heavy enough that the last two reps of each set require real effort.
Three Exercises to Start With
You do not need a complicated program. These three movements cover the patterns that matter most for the golf swing, and all three can be done with minimal equipment.
Squat to Box. This is a controlled squat where you sit back to a box or bench before standing back up. It teaches proper hip hinge mechanics, builds quad and glute strength, and is easier to learn than a full back squat. Start with a box height that puts your hips just below parallel. Add weight progressively over weeks. Aim for 3 sets of 6 to 8 reps.
Goblet Squat. Hold a kettlebell or dumbbell at chest height and squat to depth. The front-loaded position helps keep your torso upright and reinforces good movement patterns. This is an excellent starting point if you are new to strength training or coming back after time off. Again, the goal is 3 sets of 6 to 8 reps with a weight that is genuinely challenging by the final rep.
Bulgarian Split Squat. This is a single-leg squat variation where your rear foot is elevated on a bench behind you. It is harder than it looks, and it is one of the most effective exercises for building the kind of single-leg strength and stability that the golf swing demands. The lead leg in the downswing is doing a significant amount of work in a single-leg position, and this exercise trains exactly that. Start with bodyweight only, then add load once the movement feels controlled. 3 sets of 6 to 8 reps per leg.
How Quickly Can You Expect Results?
The Oranchuk study showed meaningful improvements in 8 weeks. That is two months of consistent training, three sessions per week. You do not need to be in the gym for an hour each time. A focused lower body session covering these three exercises, with proper warm-up, takes 30 to 40 minutes. Done consistently, that is enough to produce a measurable change in the physical quality that drives distance.
The effect compounds over time. Golfers who build this habit and maintain it through the season are not just hitting it further in week eight. They are protecting their joints, staying more resilient through a long season, and giving themselves a physical foundation that supports the skill work they are already doing on the range.
The Bottom Line
The core is not the engine of your golf swing. The legs are. The research is consistent on this point, and the training approach that addresses it is straightforward: two to three sessions per week, lower body strength movements, sets of 6 to 8 reps with a challenging load. Start with a squat to box, a goblet squat, and a Bulgarian split squat. Be consistent for 8 weeks. The distance will follow.
References
1. McNally MP, Yontz N, Chaudhari AMW. Lower extremity work is associated with club head velocity during the golf swing in experienced golfers. International Journal of Sports Medicine. 2014;35(9). https://doi.org/10.1055/s-0034-1367010
2. Oranchuk DJ, Mannerberg JM, Robinson TL, Nelson MC. Eight weeks of strength and power training improves club head speed in collegiate golfers. Journal of Strength and Conditioning Research. 2020;34(8):2205-2213. https://doi.org/10.1519/JSC.0000000000002505
3. Ehlert A. The correlations between physical attributes and golf clubhead speed: A systematic review with quantitative analyses. European Journal of Sport Science. 2021. https://doi.org/10.1080/17461391.2020.1829081