Heavy lifting improves running economy
High confidence
Running economy is how much energy each stride costs. Heavier weights for low reps, lifted with the intent to move fast, lower that cost more than lighter pump-style sets. Plyometrics are springy jump drills like bounding and hops. They add to this, especially at slower speeds.
Why it works
Heavy loads and fast intent call up high-threshold motor units, the muscle fibers that only switch on under real force, and they stiffen the tendons. Stiffer, better-recruited legs spend less effort on each stride. Light high-rep work does less of this.
What it means in practice
The core of a runner's strength work is heavier compound lifts, roughly 3-6 reps at 80% or more of max, pushed fast. Some explosive or plyometric work adds to that, more than long sets of light weights would. Beginners earn the heavy loads once their technique is solid.
The evidence
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In trained distance runners, both heavy resistance and plyometric training improved running economy and time-trial performance. Heavy resistance produced the larger effect on economy (g = -0.32 versus g = -0.13 for plyometrics). Either modality transfers to distance performance, so a runner can pick the one they will actually keep doing. The pooled studies used only trained populations and varied enough that the effect sizes carry real heterogeneity.
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Strength training improves running economy in highly trained middle- and long-distance runners. This meta-analysis pooled 5 controlled trials (n=93), all with VO2max above 60 ml/kg/min, in which runners added low-to-high intensity resistance work plus plyometrics 2 to 3 times per week for 8 to 12 weeks. The authors note how rarely elite runners do this: at the 2008 US Olympic Marathon Trials, nearly half reported no strength training at all. That VO2max threshold excludes typical recreational runners, so the effect at lower fitness levels stays an open question.
n=93
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Strength training improved running economy in trained middle- and long-distance runners, but the best method tracked with pace. Plyometrics helped most at lower speeds, at or below 12 km/h (ES -0.307, p=0.028). Heavy loads at 80% 1RM or above worked better at faster speeds and in runners with high VO2 max. Submaximal and isometric loading barely moved economy at all.
n=652
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Foot-ankle strengthening (Taddei 2020) cut the running injury rate 2.42-fold versus controls in recreational runners over 12 months, and in military cohorts resistance exercise at least 3 times per week was associated with 54% lower injury risk than doing none or less than weekly. Six weeks of neuromuscular training (jumping, landing, strength, endurance, agility, trunk) lowered injury incidence in track and field, most clearly for MTSS (p=0.012). Trail-runner risk factors include less running experience, skipped warm-ups, no specialized plan, asphalt training, and double daily sessions. Poor technique and weak neuromuscular control drive injuries alongside training-load problems, and more than 70% of running injuries are overuse.
Why we call confidence high
Meta-analyses in distance runners find larger economy gains from heavy and plyometric training than from submaximal-load (lighter) or isometric (holding against a fixed load) work. How big the gain is depends on running speed and the athlete's level.
Where it applies
Trained adult distance runners who already lift with sound technique.
Does not apply to: beginners who have not yet built lifting technique; runners advised against heavy loading for medical reasons.
Last reviewed Jun 19, 2026. See how we score.