Quick Answer
Strength training improves running economy through neuromuscular adaptation, not bulk. Train 2–3 sessions per week during base training, reducing to 1–2 during peak race preparation. Prioritise: single-leg Romanian deadlift, Bulgarian split squat, heavy single-leg calf raise, hip thrust, Nordic hamstring curl. Schedule on easy run days or same day as hard sessions — never the day before a long run or key interval session.
What the Research Actually Shows
The evidence on strength training for runners separates into two distinct questions: does it improve performance, and does it prevent injury? The answers are different, and understanding the distinction matters for setting realistic expectations.
On performance: the evidence is strong. A 2022 PMC narrative review concluded that lower limb resistance exercise is effective for improving running economy and performance, with a combination of strength and plyometric training being the recommended approach. Running economy — the energy cost of maintaining a given pace — is one of the most important predictors of distance running performance. When running economy improves, you can run at a faster pace for the same effort, or the same pace with less fuel expenditure over the final miles of a race. The mechanism is neuromuscular: strength training improves the efficiency of motor unit recruitment, allowing muscles to generate force with less oxygen cost per stride. This is a genuine performance benefit that multiple study designs have replicated.
On injury prevention: the evidence is more nuanced than most running articles suggest. A 2024 meta-analysis (PubMed) covering nine randomised controlled trials found that exercise-based interventions overall did not significantly reduce injury risk or rate in endurance runners. However, a post hoc analysis of the same data showed that supervised strength programmes produced significantly lower injury risk compared to control groups — suggesting the delivery method matters as much as the intervention itself. A separate randomised trial of 720 NYC Marathon runners found that a self-directed strength programme did not reduce overuse injury rates overall, but runners who were compliant (performing sessions at least twice per week) had meaningfully lower minor injury incidence than non-compliant runners. The conclusion: strength training appears to reduce injury risk when done consistently and with quality, not when done sporadically or as a box-ticking exercise.
On muscle bulk: not a real concern for distance runners. Beattie et al. (2015) followed distance runners through a 40-week strength programme and found significant improvements in leg strength without unwanted muscle mass gain. The concurrent training effect — the body’s reduced hypertrophic response when exposed to high endurance training volume — makes significant muscle gain effectively impossible for runners doing meaningful weekly mileage. You will not get slower from added bulk. What you will get is better force production per stride.
Why Running Economy Is the Key Mechanism
Running economy deserves more explanation because it’s the bridge between strength training and race performance. Two runners can have the same VO2 max — the same aerobic ceiling — but run meaningfully different times if one has significantly better running economy. Economy is the efficiency of the system, not the size of the engine.
Strength training improves economy through three pathways. First, it increases the stiffness and force-generating capacity of the tendons, which improves the elastic energy return in each stride — essentially making each footstrike more efficient at bouncing the runner forward. Second, it improves neuromuscular recruitment: stronger muscles fire more motor units on demand and fatigue later in a race, meaning the runner maintains more efficient mechanics for longer. Third, it can improve running biomechanics by correcting the muscle imbalances that cause form degradation in the second half of long runs — a weak glute that can no longer stabilise the pelvis, a calf that can no longer absorb and return force efficiently.
The practical consequence: stronger runners use less energy at the same speed. That’s a compound benefit — it manifests not just in faster times but in the ability to run harder in the final kilometres of a race or maintain pace at the end of a long training run when weaker runners are slowing down. Our tempo run guide covers how running economy determines the right effort for threshold sessions, and our guide to runners building muscle covers how strength and endurance training interact across a full training year.
The 8 Most Important Exercises for Runners
| Exercise | Primary muscles | Why it matters for runners | Sets × Reps |
|---|---|---|---|
| Single-leg Romanian deadlift | Glutes, hamstrings, lower back | Posterior chain strength in single-leg pattern; directly mirrors running mechanics | 3 × 6–8 per side |
| Bulgarian split squat | Quads, glutes, hip flexors | Single-leg strength; addresses bilateral imbalances; more running-specific than bilateral squats | 3 × 6–10 per side |
| Heavy single-leg calf raise | Gastrocnemius, soleus, Achilles | Achilles tendon loading; calf endurance for late-race pushoff; Achilles injury prevention | 3 × 10–15 per side (slow eccentric) |
| Hip thrust | Glutes (primary) | Glute power and force production at hip extension — the propulsive phase of each stride | 3 × 8–12 |
| Nordic hamstring curl | Hamstrings (eccentric) | Eccentric hamstring strength; one of the best evidence-based exercises for hamstring injury prevention | 3 × 4–6 (with control) |
| Goblet squat / back squat | Quads, glutes, core | Overall lower body force production; strength base for all other exercises | 3 × 6–10 |
| Plank / Copenhagen plank | Core, hip adductors | Anti-extension core stability; lateral hip and groin stability for mid-race form | 3 × 30–45 sec |
| Box jump / single-leg hop | Full lower body, power | Rate of force development; plyometric training improves tendon stiffness and stride power | 3 × 5–8 |
Single-Leg Romanian Deadlift
The most important exercise for runners and the one that most directly mirrors running biomechanics. Running is a single-leg sport — at every moment in the gait cycle, one leg is responsible for generating and absorbing force while the body balances above it. The single-leg RDL trains exactly this: the posterior chain (glutes, hamstrings, lower back) in a single-leg hinge pattern with a balance and stability demand. Hold a dumbbell or kettlebell in the hand opposite the working leg. Hinge at the hip, lowering the weight toward the floor while the rear leg extends behind. Keep the back flat and the working knee slightly bent. The movement should feel like a controlled single-leg balance challenge as much as a strength exercise. Start with a light weight and focus on the hip hinge rather than depth. Progress to heavier loads — 3 sets of 6–8 repetitions per side with a weight that challenges the final 2 reps.
Bulgarian Split Squat
The most effective single-leg quad and glute exercise available without a leg press machine. Stand in front of a bench or couch, place the rear foot on the surface, and lower the front leg to 90 degrees at the knee. The front leg does all the work. This exercise addresses the bilateral strength imbalances that accumulate in runners — one leg typically stronger than the other — which is one of the most common contributors to overuse injuries. Hold dumbbells at the sides or in a goblet position to load progressively. The first 2–3 sessions will feel uncomfortable as the rear ankle and hip flexor adapt; persist through this and the exercise becomes more manageable. Our hip flexor stretching guide covers the mobility work that helps beginners access the full range of this exercise.
Heavy Single-Leg Calf Raise
The most undertrained exercise for runners, and one of the most important. The calf and Achilles complex absorbs and returns elastic energy at every footstrike — a 70kg runner running at 5:00/km generates a ground reaction force of approximately 2.5 times body weight at each step. The calf raise trains the eccentric (lowering) phase that absorbs this force and the concentric (rising) phase that returns it. Perform on a step with the heel dropping below the edge for full range, and add load via a loaded backpack or holding a dumbbell. The eccentric phase should take 3–4 seconds. Progress to single-leg — each leg should be capable of 15+ slow repetitions with added load before moving to harder exercises. Our tibialis anterior exercises guide covers the complementary front-of-shin strengthening that pairs with calf work for lower leg injury prevention.
Hip Thrust
The most direct exercise for the gluteus maximus — the primary propulsive muscle in running. The hip thrust isolates hip extension through a full range of motion that squats and deadlifts don’t fully replicate. Rest the upper back against a bench, drive the hips upward with a weight plate or barbell across the hips, and squeeze the glutes hard at the top. The glutes generate the hip extension force that propels the runner forward at push-off; weak glutes shift this burden to the hip flexors and lower back, both of which fatigue faster and are more injury-prone. Progress from bodyweight to loaded with 20–40kg on the hips as strength builds.
Nordic Hamstring Curl
One of the most evidence-supported exercises for injury prevention across all sports. The Nordic curl trains the hamstrings in eccentric contraction — the muscle lengthens under load — which is the most injury-relevant portion of hamstring function during running. Kneel on a soft surface with the feet anchored (under a barbell, bench, or held by a training partner). Slowly lower the upper body toward the floor, controlling the descent entirely with the hamstrings. Return to start by pressing up with the hands. This is harder than it looks and most runners can only manage 3–4 controlled reps when starting. Progress by reducing the speed of the lowering phase rather than increasing reps. Add 1–2 reps per session over weeks.
The 12-Week Strength Programme for Runners
This programme is structured in three phases aligned with how most runners organise their training year. The progression moves from learning movement patterns to building strength to developing power — the same periodisation used by elite endurance athletes.
Scheduling rule: Never perform a heavy strength session in the 24–48 hours before a long run, tempo session, or race. Schedule strength on easy run days or the same day as hard intervals. During peak marathon or race training, reduce to 1–2 sessions per week and prioritise quality over volume.
Phase 1 — Adaptation (Weeks 1–4): The goal is learning movement patterns and conditioning connective tissue for heavier loads in phases 2 and 3. Use bodyweight or light dumbbells. 2–3 sessions per week. Session duration: 25–35 minutes. Exercises: goblet squat 3×12, single-leg RDL 3×10 per side (bodyweight), hip thrust 3×15, single-leg calf raise 3×15 per side, plank 3×30 seconds, Copenhagen plank 3×20 seconds per side. Focus on quality of movement rather than load. Expect some muscle soreness in the first 2 weeks — this is normal adaptation and will settle.
Phase 2 — Build (Weeks 5–8): Add load progressively. 2–3 sessions per week. Session duration: 35–45 minutes. Exercises: Bulgarian split squat 3×8 per side (dumbbells), single-leg RDL 3×8 per side (dumbbell), hip thrust 3×10 (loaded), heavy single-leg calf raise 3×12 per side (loaded, slow eccentric), Nordic hamstring curl 3×4–6, plank variations 3×40 seconds. The target is that the final 2 reps of each set are genuinely difficult. If all 8 reps feel easy, the load is too light — progressive overload is what drives adaptation.
Phase 3 — Strength and Power (Weeks 9–12): Heavy compound work and plyometrics. 2 sessions per week during race training. Session duration: 40–50 minutes. Exercises: back squat or goblet squat 3×5 (heavy), single-leg RDL 3×6 per side (heavy dumbbell or barbell), hip thrust 3×8 (heavy), single-leg calf raise 3×10 per side (max load, slow eccentric), box jump 3×5, single-leg hop 3×5 per side, Nordic hamstring curl 3×5. The plyometric exercises in this phase are the mechanism for transferring the strength gains from the gym to improved rate of force development on the road. Our warm-up and cool-down guide covers how to prepare the joints for heavier sessions and recover effectively afterward.
Maintenance (Race training and beyond): Once Phase 3 is complete, 1–2 sessions per week maintains the gains built over 12 weeks. Reduce volume (fewer sets) but maintain load intensity — the load is what preserves strength adaptations, not the number of sets. During a marathon taper, reduce further and stop heavy training 10–14 days before the race.
How to Schedule Strength Training Around Running
Scheduling is the most common point of failure for runners trying to add strength training. The right structure groups hard efforts together rather than spreading them across the week, leaving recovery days genuinely free for adaptation.
A practical week for a runner training 5 days with 2 strength sessions: Monday — easy run + strength (after the run); Tuesday — rest or easy run; Wednesday — intervals or tempo; Thursday — easy run; Saturday — long run; Sunday — rest. Strength on Monday groups it with easy running, leaving Tuesday available for recovery. Wednesday’s intervals are quality running without the interference of preceding strength work. The long run on Saturday has 48 hours of clean recovery before it. This structure works for most recreational runners training for 5km through to marathon.
During high-mileage marathon training blocks — particularly weeks exceeding 70–80km — reduce strength frequency to 1 session per week. The running itself is providing sufficient musculoskeletal stimulus; additional strength volume at this point adds recovery demand without proportional benefit. Our guide on building marathon mileage safely covers how to balance the total training load across a long preparation block. Our beginner running guide covers how runners just starting out should phase in strength work alongside their initial mileage build.
Common Mistakes Runners Make With Strength Training
Using too light a weight. The most common error. A set of 15 bodyweight squats does not produce the neuromuscular stimulus needed to improve running economy. Research consistently shows that heavy resistance training — working at 70–85% of maximum — produces the running economy improvements that lighter training does not. If the exercise isn’t hard by the final 2 reps, increase the load.
Doing strength the day before long runs. Heavy strength training causes muscle damage that peaks 24–48 hours after the session. Performing a heavy squat session on Friday when Saturday is a 25km long run produces a long run done on damaged, glycogen-depleted legs. This is the scheduling mistake that makes runners feel that strength training is making them tired. It isn’t — the timing is wrong.
Stopping strength training during race training. Many runners do their strength work diligently through winter base training and then drop it entirely when race-specific training begins. The strength gains built over months begin deteriorating within 2–3 weeks of cessation. Reducing to 1 session per week maintains the gains; stopping entirely wastes the base-phase investment. The goal during race training is maintenance, not progression.
Only doing core and bodyweight work. Core exercises are valuable but insufficient. The research showing running economy improvements consistently involves heavy lower-body compound exercises — deadlifts, squats, split squats — not core circuits or resistance band work. Core stability supports form; lower-body strength drives the neuromuscular adaptations that change running economy. Both are necessary; neither is sufficient alone.
Run Stronger With a Plan That Includes Strength
SportCoaching's running coaching and training plans integrate strength work alongside structured running sessions — so the timing, load, and progression of strength training is built into your plan rather than something you're trying to fit around it.
FAQ: Strength Training for Runners
How often should runners do strength training?
2 sessions per week minimum; 3 during base training. Reduce to 1–2 during peak race preparation. Never the day before a long run or key session. Group hard days together — strength on the same day as easy runs or intervals, leaving the following day as full recovery.
Will strength training make runners bulky or slower?
No. A 40-week study found runners improved leg strength significantly without gaining muscle mass — the concurrent training effect (high endurance volume suppresses hypertrophy) prevents meaningful bulk gain for distance runners. Improved neuromuscular efficiency from strength training consistently improves running economy, making runners faster rather than slower.
Does strength training improve running economy?
Yes — this is the strongest and most consistent finding in the research. A 2022 PMC narrative review confirmed lower limb resistance exercise improves running economy and performance. The mechanism: neuromuscular efficiency improvements reduce the energy cost of each stride. Better economy means faster racing at the same effort, or the same pace with better fuel efficiency over long distances.
What are the most important strength exercises for runners?
Single-leg Romanian deadlift (posterior chain, single-leg stability), Bulgarian split squat (single-leg quad/glute, imbalances), heavy single-leg calf raise (Achilles loading), hip thrust (glute power), Nordic hamstring curl (eccentric hamstring strength), and anti-rotation core work (plank, Copenhagen plank). Add plyometrics — box jumps, single-leg hops — once the strength foundation is established.
When should runners do strength training in their training week?
Same day as easy runs or hard intervals — never the day before a long run, tempo, or race. During peak marathon training, reduce to 1–2 sessions per week, maintaining load intensity but reducing volume. Consistency across months matters more than any single session.
Find Your Next Running Race
Ready to put your training to the test? Here are some upcoming running events matched to this article.
