Runners benefit most from a combination of heavy compound lifts, single-leg exercises, and core work, performed two to three times per week. Adding strength training to a running program improves running economy by 2 to 8 percent, meaning you use less energy at the same pace. That improvement comes not from bigger muscles but from changes in how your nervous system recruits muscle fibers and how your tendons store and release energy.
Why Strength Training Makes You a Better Runner
Every stride you take is essentially a small single-leg landing followed by a push-off. The force required to maintain your pace is well below your maximum capacity, so the stronger you are, the smaller the percentage of your total strength each stride demands. That translates directly to less fatigue over long distances.
The primary adaptations happen in your nervous system and connective tissue, not in muscle size. Strength training improves motor unit recruitment and firing frequency, which helps your legs resist the impact forces of each footstrike more efficiently. Your tendons also get stiffer in a good way: one study found a nearly 16 percent increase in tendon stiffness after a strength program, which improved the tendons’ ability to act like springs, storing and returning energy with each step. These changes allow the muscle fibers in your legs to work closer to an isometric state during ground contact, meaning they hold tension without lengthening or shortening much. That’s the most energy-efficient way for a muscle to operate during running.
Importantly, these improvements happen without increases in body weight, oxygen consumption, or other cardiovascular changes. The gains are almost entirely neuromuscular.
Heavy Lifting Beats Light Lifting
A meta-analysis comparing heavy resistance training to plyometric training (jump-based exercises) found that heavy lifting produced greater improvements in both running economy and race performance. Loads at or above 90 percent of your one-rep max showed a small but meaningful effect, while lighter loads produced only trivial changes. One study specifically looking at lifting at 80 percent of max found a measurable improvement in 5K time trial performance.
This doesn’t mean plyometrics are useless. Explosive exercises like box jumps and bounding still contribute to the power component of running, particularly for races with surges or hills. But if you’re choosing between lifting heavy and doing lots of jump training, the evidence favors heavy lifting as the foundation. The key is choosing weights that are genuinely challenging for low rep counts, not doing high-rep circuits with light dumbbells.
The Best Compound Exercises for Runners
Your strength sessions should revolve around multi-joint movements that load the same muscles and joints used in running. These are the essentials:
- Squats: The foundational lower-body exercise. Keep your feet shoulder-width apart, toes forward, and focus on not letting your knees drift past your toes. You can start with bodyweight or a medicine ball and progress to barbell back squats or front squats.
- Deadlifts: Train the entire posterior chain, including your glutes, hamstrings, and lower back. These build the hip extension power that drives you forward with each stride.
- Lunges: Closer to the actual running motion than a squat because they load one leg at a time in a split stance. Forward, reverse, and walking variations all work.
- Step-ups: Place one foot on a box and drive your body upward using only that leg, bringing the opposite knee toward your chest at the top. This mimics the single-leg drive phase of running.
Single-Leg Work for Injury Prevention
Running is a unilateral sport. You’re never on both feet at the same time. That means imbalances between your left and right sides, or compensations where one muscle group picks up slack for a weaker one, accumulate over thousands of repetitions and eventually cause injury. Single-leg exercises expose and correct these imbalances.
The single-leg Romanian deadlift is one of the most valuable exercises a runner can do. Standing on one leg, you hinge forward at the hips while the other leg extends behind you, lowering a weight toward the floor until you feel a stretch in the standing leg’s hamstring. This builds hip stability, hamstring strength, and balance simultaneously. The single-leg glute bridge is another staple: lying on your back, you lift one foot off the floor and press through the other heel to raise your hips, targeting the glute on the working side. This directly strengthens the muscle responsible for keeping your pelvis level during the stance phase of each stride.
A weak or unstable pelvis during running forces your body to compensate, often by overloading the knees, IT band, or lower back. Prioritizing single-leg strength addresses the root cause of many common running injuries.
Core Training That Actually Helps
Core strength for runners isn’t about aesthetics. It’s about maintaining your posture and reducing wasted movement as you fatigue. Research has shown that poor core endurance negatively affects running mechanics, and the inability to hold your trunk position increases loading on your legs during long runs. An eight-week core training program improved running economy in college athletes by lowering both oxygen consumption and heart rate at the same pace.
Effective core exercises for runners progress through three stages. Start with fundamental holds and movements: planks, side planks, bridges, and crunches. After a few weeks, add instability by using a balance pad or resistance band during planks. Finally, incorporate dynamic movements like mountain climbers and the Pallof press (a standing anti-rotation exercise using a cable or band). The dead bug, where you lie on your back and slowly extend opposite arms and legs while keeping your lower back pressed to the floor, is an excellent warm-up that activates nearly all the core muscles runners rely on.
Two to four core sessions per week, which can be short and tacked onto the end of a run or lifting session, are enough to see results within four to eight weeks.
How Often and How Much
The right frequency depends on where you are in your training. A practical approach breaks the year into three phases:
During your base-building or off-season period, aim for three to four sessions per week, about 30 minutes each. Focus on bodyweight and light resistance at 12 to 15 reps per set. This builds stability and movement quality. Stay here for at least four to six weeks, longer if you’re coming back from injury or are new to lifting.
As you shift into a strength-focused block, drop to two sessions per week of 45 to 60 minutes. This is where the heavy lifting happens. Use weights that are challenging for 6 to 8 reps, performing about 3 sets per exercise. Never go to true failure. Always finish a set feeling like you could do one or two more clean reps. Four weeks in this phase produces significant gains.
When you move into race-specific or peak training, reduce to one or two sessions per week of 30 to 45 minutes. Keep reps low (4 to 6) for power exercises and limit total jumping repetitions to 20 to 30 per workout. In the final week before a goal race, cut strength work down to a few light stability exercises to keep the glutes and core activated without creating fatigue.
Fitting Strength Into a Race Training Plan
One of the biggest mistakes runners make is dropping strength training entirely as mileage increases. The evidence supports continuing to lift all the way through your race preparation, just with decreasing volume and intensity. A useful framework divides your total training period into thirds.
In the early third, lift the heaviest: 4 to 5 sets of 4 to 6 reps at high loads. Your running volume is still moderate, so your body can absorb the strength stimulus. During the middle third, reduce the weight and number of sets while increasing reps slightly. Your running workouts are getting harder, so the lifting should get easier. In the final third, decrease the weight further, push reps up to around 15, and drop the frequency by one day per week. The goal is maintenance, not gains.
Schedule lifting sessions on the same days as hard running workouts when possible, leaving your easy days truly easy. Placing a strength session after a tempo run or interval workout consolidates the stress into one day and gives you a full recovery day afterward. If you must lift on a separate day, allow at least six to eight hours between a hard run and a lifting session.