The short answer
Strength training can be a useful part of marathon preparation. Systematic reviews suggest that high-load strength work, plyometrics, or a combination of methods can improve running economy and may improve time-trial or time-to-exhaustion performance in some middle- and long-distance runners.146
That does not mean strength guarantees a faster marathon or prevents running injuries. A 2024 runner-specific meta-analysis found no significant overall reduction in injury risk or injury rate from exercise-based prevention programmes; a supervised subgroup looked more promising, but most included studies were low quality.3
The useful question is therefore not “Do runners need strength?” It is: What dose supports this runner’s goal without degrading the running that matters most this week?
Evidence reviewed: July 15, 2026. This article is educational and not medical advice.
What the evidence supports—and what it does not
| Claim | A responsible reading of the evidence | What not to promise |
|---|---|---|
| Strength can improve running economy | High-load and combined methods produced small-to-moderate improvements in a 2024 meta-analysis; effects varied with method, speed, and athlete characteristics.1 | That every runner will use less oxygen at every pace |
| Strength can improve performance | A separate 2024 review reported performance benefits from high-load and combined training, with evidence certainty ranging from very low to moderate.2 | A specific percentage improvement or personal best |
| Heavy work may outperform lighter work for some outcomes | Earlier reviews generally favoured heavy resistance or combined methods over low-load work for economy and performance.46 | That near-maximal lifting is appropriate for every runner |
| Exercise can build useful capacity | Strength can improve force production and give the plan another way to develop capacity besides adding run impact.8 | An “injury-proof” body or a universal tissue-resilience score |
| Injury prevention remains uncertain | Pooled runner-specific trials did not show a significant overall injury reduction; supervision may matter, but the evidence is limited.3 | That two gym sessions automatically prevent knee, shin, tendon, or bone injuries |
This distinction matters. Running economy is a laboratory or field performance construct. Injury is a multi-factor outcome shaped by exposure, prior injury, symptoms, recovery, energy availability, technique, environment, and chance. Evidence for one outcome cannot simply be transferred to the other.3
Why strength may help a marathon runner
It can change the cost of running
Running economy describes the energy or oxygen cost of moving at a submaximal speed. Two runners can have similar aerobic capacity but use it differently because their economy, threshold, pacing, and fatigue resistance differ.
The 2024 running-economy review included programmes lasting 6–24 weeks and one to four sessions per week. High-load and combined methods improved economy on average, while submaximal and isometric methods did not show the same pooled effect.1 That is a group result, not a personal forecast.
It can support force and late-run control
Marathon running is not a maximal-strength event, but every stride still requires force. A runner who can produce a given force at a lower fraction of their maximum may find that pace more economical. Strength can also give the athlete options for developing calves, hips, hamstrings, trunk control, and single-leg force without obtaining every adaptation from more running.
That mechanism is plausible and supported by performance reviews, but “stronger” and “faster marathon” are not interchangeable. The strength dose still has to coexist with long runs, threshold work, sleep, fueling, and ordinary life.28
It can broaden the plan without replacing specificity
The closer the goal gets, the more important race-specific running becomes. Strength remains supportive work. It should not crowd out the long run, key marathon-pace work, or the recovery needed to absorb them.
If strength consistently makes the next important run worse, the answer is usually to change the dose or placement—not to declare that soreness proves the programme is working.
The weekly strength decision aid
Use this before adding or progressing a session.
| Current situation | Best next decision | Why |
|---|---|---|
| Running is consistent, key sessions are stable, and strength technique is familiar | Keep one or two planned sessions and progress one variable slowly | Strength can accumulate without becoming the week’s main stressor |
| New to lifting or returning after a long break | Start with one short, supervised or technically simple session | Early soreness and unfamiliar movement are avoidable costs |
| Peak marathon weeks are already demanding | Maintain movement patterns but reduce sets, exercise count, or load | Preserve the adaptation while protecting race-specific work |
| A key run has been poor after strength twice in a row | Move the session, reduce the dose, or remove the least useful exercise | Repeated interference is evidence that the current placement is wrong |
| Sharp pain, worsening focal pain, loss of function, or symptoms that alter gait | Stop the provoking exercise and seek appropriate assessment | A training article cannot diagnose the cause |
| Illness, marked fatigue, or a disrupted week | Hold or reduce strength instead of cramming it beside missed running | The plan should respond to the whole week, not repay every missed task |
This is a decision framework, not a universal prescription. Training history, equipment, technique, age, symptoms, and goal phase can change the responsible choice.
What to train without duplicating a gym programme
The exact exercise is less important than the movement job, good technique, and progressive loading. A compact runner-focused session can cover:
- a squat or split-squat pattern;
- a hip-hinge pattern;
- straight-knee and bent-knee calf work;
- a push or pull for the upper body;
- trunk resistance to rotation, extension, or side-bending;
- optional low-volume jumping only when landing skill and recovery are ready.
Choose one exercise for each necessary job. More variety is not automatically more complete.
If you want a specific exercise sequence, use the existing two-day gym plan for runners. That page owns the workout-template intent. This page owns the evidence and the decision about whether strength should stay, shrink, or pause.
How to place strength around marathon training
Protect the key run
Identify the one or two running sessions that matter most this week. Place unfamiliar, high-volume, or heavy lower-body work far enough away that it does not predictably damage those sessions.
There is no evidence-based rule that every runner needs exactly 24 or 48 hours. Use the actual response:
- Did normal stride and pace return by the key session?
- Did soreness change mechanics?
- Did the athlete need to turn the planned workout into recovery running?
- Did the same problem recur after the same placement?
The calendar should learn from those answers.
Combine stress when it protects recovery days
Some runners place strength after an easy run or later on a quality day so that easy or rest days remain easy. Others do better separating gym and quality running. Neither arrangement is universally superior.
Test one arrangement for two or three weeks while keeping the rest of the programme stable. Choose the version that preserves running quality and is realistic enough to repeat.
Reduce dosage before deleting the habit
During a busy or high-mileage week, reduce in this order:
- optional accessories;
- one set from secondary movements;
- plyometrics or unfamiliar exercises;
- total load on the main movements;
- the entire session only when recovery or symptoms require it.
A 20-minute maintenance session may be more useful than repeatedly scheduling a 60-minute session that never happens.
A simple progression rule
Progress only when all three are true:
- technique stayed controlled through the current range;
- the next important run was not meaningfully degraded;
- soreness and fatigue returned to the athlete’s normal range.
Then change one variable: load, repetitions, sets, range, or exercise complexity. Do not increase all of them in the same week.
This is a practical coaching inference, not a claim that one progression model is medically safer. The research programmes vary widely, and reviews repeatedly note differences in athlete level, methods, and evidence certainty.14
Strength across a 26-week build
Foundation
Use technically repeatable movements and conservative loads. The first goal is to make strength compatible with the training week. A beginner does not need maximal loads or jumping to earn a useful adaptation.
Build
Progress the main patterns if running quality and recovery remain stable. One or two consistent sessions can be a practical arrangement, but the trials behind the evidence used one to four weekly sessions; the literature does not establish a universal number for every marathon runner.1
Peak
Maintain useful force while reducing anything that creates avoidable fatigue. The strength session becomes smaller as the race-specific cost of the running programme rises.
Taper and race week
Avoid novel exercises, testing maximal lifts, or chasing soreness. Keep only work the athlete already tolerates and remove it when it competes with freshness. Strength fitness does not disappear because one race-week session was skipped.
Soreness is not the score
Delayed muscle soreness can happen after a new or larger stimulus. It is not a reliable measure of programme quality.
Reduce or stop the session when:
- pain sharpens during a movement;
- symptoms become more focal or worsen set by set;
- the athlete changes movement to protect one side;
- ordinary walking or stairs become meaningfully impaired;
- fatigue, illness, or under-fueling makes the planned load irresponsible.
Persistent pain, suspected injury, or symptoms affecting normal function need appropriate clinical assessment. Strength training is not a substitute for physiotherapy or medical care.
How 26weeks.ai fits
26weeks.ai treats strength as one part of a goal-first training week. The shipped plan system can schedule strength alongside running and use recovery, availability, recent training, and weekly review signals within deterministic guardrails.
It cannot diagnose pain, guarantee injury prevention, or know that a particular lift is technically safe for you. The useful product promise is smaller and stronger: when work, fatigue, or missed sessions change the week, the plan can adapt without asking you to stack everything back in.
FAQs
Does strength training make marathon runners faster?
It can improve running economy and some performance outcomes on average, especially in high-load or combined programmes.146 It does not guarantee a faster marathon for an individual.
Does strength training prevent running injuries?
Current runner-specific pooled evidence does not show a significant overall reduction in injury risk or rate from exercise-based programmes. A supervised subgroup looked more favourable, but the evidence was limited and often low quality.3
How many strength sessions should a marathon runner do?
There is no universal number. One or two sessions is a practical starting range for many plans, while the programmes in a 2024 economy review ranged from one to four sessions per week.1 The right dose is the one that can progress without repeatedly damaging key running.
Should strength stay in peak marathon weeks?
Usually as a smaller maintenance dose if it is familiar and well tolerated. Reduce or remove it when it compromises race-specific work, recovery, or symptoms.
Are plyometrics essential?
No. Reviews suggest plyometrics can improve economy in some settings, but high-load and combined strength also have evidence.1 Landing skill, current load, and recovery determine whether jumping is useful now.