Strength training for runners
Evidence: strong
Heavy resistance and plyometric work reliably improve running economy, without adding race weight. The economy gain is well-evidenced; the size of the carry-over to race performance is less certain.
Adding heavy resistance or plyometric training to distance running reliably improves running economy, with several independent meta-analyses agreeing on the direction (Blagrove, Howatson & Hayes 2018; Llanos-Lagos et al. 2024).
Economy improves by roughly 2 to 4% on average, with some studies reporting gains up to about 8%, while VO₂max, lactate measures and body composition are largely unchanged (Blagrove et al. 2018). That last point matters for runners worried about adding bulk: the gains come from neuromuscular changes, not added muscle mass, so they do not cost race weight. Time-trial performance over 1.5 to 10 km tends to improve too, though the performance trials are fewer and smaller than the economy ones, so that carry-over is the less certain part of the case. Heavy resistance training has a slightly larger effect on economy than plyometrics (Eihara et al. 2022).
An adjunct, not a replacement
Strength work improves the economy of running you are already doing; it is a supplement to running volume, not a substitute for it. The gains show up in races only on top of a consistent running base.
The mechanism is improved force production and efficiency: delayed recruitment of fatigable fibres, better neuromuscular coordination, and increased musculo-tendinous stiffness, which stores and returns more elastic energy with each stride (Rønnestad & Mujika 2014).
Injury prevention
The economy gains may not even be the main reason to lift. Strength training is among the best-evidenced ways to reduce sports injuries generally. A meta-analysis found that strength-training programmes roughly halved overall injury risk and cut overuse injuries, the kind that plague runners, by around a third to a half, with a dose-dependent effect; stretching, by contrast, did not (Lauersen et al. 2018). That meta pooled mostly general-sport and military cohorts rather than runners, so the figures transfer to running by inference rather than direct trial, but the mechanism is intuitive: stronger muscles, tendons and bones tolerate the repetitive loading of running better, and better neuromuscular control reduces the breakdowns in form that precede many overuse injuries.
The strongest case for lifting
For many runners, injury prevention is a better reason to strength-train than the economy gain. Staying healthy enough to train consistently does more for performance over a season than any single session, and strength work is the intervention with the best evidence for keeping runners on the road.
For runners whose limiter is getting injured rather than raw fitness, this is the highest-value training they are probably not doing. It also compounds with the economy benefit: the same twice-weekly heavy and plyometric work delivers both.
A practical prescription with support is resistance and plyometric work two to three times a week over 8 to 12 weeks (Balsalobre-Fernández et al. 2016). The trials remain relatively small and short, so the precise effect size is moderate even though the direction is consistent. Collagen with vitamin C before loading may help tendon resilience, though it is not a performance enhancer; see collagen and vitamin C.
The lifts that work
The exercises behind the economy and injury evidence are heavy, multi-joint, lower-body lifts loaded for low repetitions, plus a small amount of explosive work (Llanos-Lagos et al. 2024; Eihara et al. 2022). A simple, well-supported menu:
- Squat (back or front). The most studied lift in the running-economy trials, loading the quadriceps, glutes and trunk through a full range.
- Deadlift and Romanian deadlift. Load the posterior chain, the hamstrings, glutes and back that extend the hip in late stance.
- Split squat, lunge and step-up. Single-leg patterns that match running’s one-leg-at-a-time loading and expose side-to-side imbalances.
- Hip thrust. Targets the glutes with little load on the spine.
- Calf raises, straight- and bent-knee. Load the gastrocnemius, soleus and Achilles, the spring of the stride and a frequent injury site; the bent-knee version biases the soleus, which bears the largest forces in running.
- Plyometrics. Ankle hops, bounding and, once tolerated, drop jumps train the stretch-shortening cycle and tendon stiffness that return elastic energy. Build up gradually; see plyometrics.
Load and dose are what make it work. The productive range is heavy: roughly three to six repetitions per set at a weight near the limit of what you can lift with good form, two or three times a week (Balsalobre-Fernández et al. 2016). Light, high-repetition circuits do not drive the same neuromuscular adaptation. Learn each movement with a lighter load, add weight as form holds, and keep the heaviest lifting away from hard running days.