Do You Need to Run More to Improve 5K Time or Add Strength Training for Runners
Many runners hit a familiar point in 5K training. The early improvements come quickly, then the same weekly routine stops producing the same result. The obvious answer seems to be more miles. Sometimes that works. Sometimes it simply adds fatigue without much extra speed.
A recent LAMBS Fitness poster comparing “Running Only” with “Running + Strength Training” raises a useful question: do faster 5K runners just need higher weekly running mileage, or can strength training help runners improve with a more balanced plan?
The honest answer is that appropriate running volume matters, but mileage alone is not the whole picture. A better 5K depends on aerobic fitness, running economy, training intensity, recovery, strength, experience, consistency, and individual response.
Strength training for runners is not a shortcut that replaces running. It is a tool that can support better running when it is programmed well.
Running more can help, but only when the extra work is useful
For a 5K, running fitness is still the foundation. The event relies heavily on aerobic energy production, even though it feels fast and uncomfortable. Regular running helps develop:
A stronger aerobic system
Better tolerance of race pace
More efficient movement through repeated practice
Improved pacing judgement
Greater confidence across the distance
That is why many runners improve when they move from irregular training to consistent weekly running. A runner doing one or two short runs per week will often benefit from adding another easy run before worrying about advanced sessions.
But there is a limit to the “just run more” approach. Weekly running mileage is only one input. The body still has to absorb the work. If the extra distance reduces sleep quality, makes every run feel heavy, or removes the ability to complete faster sessions well, it may not improve 5K time.
Two runners can also respond differently to the same plan. One runner may thrive on higher volume. Another may progress with moderate mileage and better intensity control. Training history, age, stress, injury background, nutrition, sleep, biomechanics, and available time all affect what is realistic.
This is why the poster should be treated as a conversation starter rather than a scientific prescription. It is useful to compare a running-only approach with a strength and running approach, but exact mileage figures should not be read as proven requirements. Strength training does not guarantee that a runner can reduce mileage by a specific amount and achieve the same result.
The better question is: what is the minimum effective training needed to create progress while staying sustainable?
Running economy explains why fitness is not the only factor
Running economy is one of the most useful concepts for recreational runners to understand. In simple terms, it means how much energy a runner uses to maintain a given pace.
Think of two runners with similar aerobic fitness. Both have strong engines. One uses slightly less energy at 5K pace because they apply force more effectively, waste less movement, and maintain posture better when tired. That runner is more economical and may perform better, even if their fitness test results look similar.
Running economy is influenced by many factors, including:
Tendon stiffness and elastic energy return
Muscle coordination
Stride mechanics
Ground contact time
Strength and power
Fatigue resistance
Footwear and surface
Running experience
Research in distance runners has shown that running economy is strongly linked with performance, especially when runners are already reasonably trained. VO2 max matters, but it does not explain everything. Studies and reviews in sports science have also reported that appropriately designed resistance training and plyometric training can improve running economy in trained and recreational runners.
That does not mean every squat instantly makes someone faster. The details matter. The benefit seems most likely when strength training improves the runner’s ability to produce force, control impact, and use stiffness and elasticity effectively without adding excessive fatigue.
Strength training can complement the running that matters most
Strength training for runners is sometimes misunderstood. It is not bodybuilding with a little jogging added. It is also not endless light exercises that never become challenging.
For 5K performance, useful strength work tends to target the qualities that support running:
Producing force through the hip, knee, and ankle
Controlling single-leg positions
Maintaining posture under fatigue
Improving tendon and muscle capacity
Developing stiffness and reactivity through safe jumping and hopping progressions
Evidence from systematic reviews, including work by researchers such as Balsalobre-Fernández and colleagues, suggests that resistance training can improve running economy and performance markers in distance runners. Reviews discussing strength and endurance training, including work by Blagrove and colleagues, also describe benefits when programmes include heavy resistance training, explosive work, or plyometrics alongside running.
The key phrase is appropriately programmed. Strength training should support the running plan, not compete with it.
A sensible weekly plan may include 1 to 2 strength sessions. These sessions might include movements such as:
Squats or split squats
Deadlift patterns
Step-ups
Calf raises
Hip thrusts or bridges
Single-leg balance and control work
Low-volume plyometrics such as pogo jumps, hops, or bounds
For many recreational runners, the biggest gains come from learning to lift with good control, progressing gradually, and avoiding soreness that disrupts run quality. Heavy strength work can be useful, but it should be introduced carefully. Plyometrics can also be effective, but they place high demand on tendons and joints, so volume and progression matter.
A simple example:
Running only
Running plus strength training
More of the same running may build aerobic capacity, but it can leave gaps in strength, power, and load tolerance.
Running remains the priority, while strength work supports force production, control, and resilience.
This is where good Running Coaching can help. The best plan is rarely the hardest plan on paper. It is the plan that a runner can repeat, recover from, and progress over time.
Injury risk is about load, recovery, and capacity
It is tempting to say that high mileage causes injury and strength training prevents injury. That is too simplistic.
Running injuries are usually linked to a mix of factors. Training load is one part of the picture, but so are previous injury, sudden changes in volume or intensity, recovery, sleep, stress, footwear changes, terrain, strength, mobility, and individual tissue tolerance.
Higher training loads can create greater recovery demands. If a runner increases volume too quickly, adds speed work at the same time, and does not recover well, risk may rise. But mileage is not automatically harmful. Many runners tolerate higher mileage well when it is built gradually and balanced with easy running.
Strength training is not a guarantee against injury either. A poorly timed gym session can create soreness and fatigue. Too much jumping too soon can irritate calves or tendons. Loading must be sensible.
Used well, strength training can improve physical capacity and load tolerance. That means the muscles, tendons, and connective tissues may be better prepared to handle the forces of running. This makes strength training one part of injury-risk management, along with:
Gradual progression
Enough easy running
Planned recovery
Good sleep
Appropriate footwear and surfaces
Listening to early warning signs
Adjusting training during stressful periods
A useful question is not “What prevents injury?” A better question is “What helps this runner tolerate the training needed to improve?”
A practical weekly approach for recreational 5K runners
A strong 5K plan does not need to be complicated. It should include enough running to develop fitness, enough intensity to prepare for race pace, enough strength work to support performance, and enough recovery to adapt.
For many recreational runners, a balanced week might include 3 to 5 runs and 1 to 2 strength sessions. The exact number depends on current fitness, training age, injury history, and time available.
Keep easy runs genuinely easy
Easy running builds aerobic fitness without creating too much fatigue. It also allows more total training to be completed across the week.
A common mistake is running easy days too hard. This can make interval sessions worse and reduce recovery. Easy pace should feel controlled. Conversation should be possible.
Include faster running with a clear purpose
To improve 5K time, most runners need some exposure to faster work. This could include:
Short intervals faster than 5K effort
Repeats around 5K pace
Tempo or threshold-style running
Hill reps
Strides after easy runs
The right session depends on the runner. A newer runner may benefit from short hill reps and relaxed strides. A more experienced runner may use structured intervals such as repeated 400 m, 800 m, or 1 km efforts.
The goal is not to suffer every week. The goal is to apply a clear stimulus and recover from it.
Add strength without turning every week into a grind
One or two well-designed strength sessions can fit neatly into 5K training. A practical session may include:
A lower-body strength movement
Examples include squat, trap bar deadlift, or split squat.
A single-leg movement
Examples include step-up, lunge, or single-leg Romanian deadlift.
A calf and ankle movement
Examples include standing calf raise, seated calf raise, or pogo progression.
A trunk or hip control exercise
Examples include side plank, dead bug, or loaded carry.
A small dose of plyometric work if appropriate
Examples include pogo jumps, skipping, or low-volume hops.
Strength sessions do not need to be long. Quality matters more than exercise variety. Many runners do well with 30 to 45 minutes.
Timing also matters. Hard strength work often fits best after an easier run or on the same day as a harder run, leaving true recovery days easier. This “hard days hard, easy days easy” approach can reduce the number of moderately tiring days in the week.
Increase training progressively
Progress usually comes from small increases repeated consistently. That may mean adding a little distance, adding one extra run, increasing interval volume, or gradually progressing strength load.
Avoid changing everything at once. If weekly running mileage increases, keep strength training steady. If strength training becomes heavier, avoid adding a new speed session in the same week. If life stress is high, hold training steady or reduce it.
Adaptation happens after the session, not during it. Recovery is part of the programme.
The poster’s message is useful if it starts the right discussion
The value of the “Running Only” versus “Running + Strength Training” comparison is that it challenges a common assumption. Many runners believe the only route to a faster 5K is more mileage.
More running can help, especially when current volume is low. But the best 5K training needs more than distance. It also needs the right mix of intensity, consistency, economy, strength, and recovery.
The poster should not be read as saying there is one perfect mileage target or that adding strength means a runner can automatically do fewer miles. Optimal mileage varies widely. Some runners need more aerobic volume. Others need better pacing, more recovery, improved strength, or more targeted faster running.
A more useful framework is:
Run consistently before chasing complexity.
Build weekly running mileage gradually.
Use easy runs to build capacity.
Use faster sessions sparingly but purposefully.
Add strength training that supports running, not replaces it.
Track how the body responds.
Adjust before fatigue becomes a problem.
This approach respects both sides of the discussion. Running makes runners better at running. Strength training can help runners use their fitness more effectively.
Better training means finding the right dose
The goal of 5K training is not to collect the most miles or the hardest workouts. The goal is to create enough stimulus to improve, then recover well enough to repeat the process.
For some runners, that will mean increasing running volume. For others, it will mean keeping mileage stable while adding strength, improving recovery, or making hard sessions more specific. Many runners need a blend.
Strength and running can work very well together when the plan is realistic. A runner who completes three consistent runs and one strength session every week may progress better than a runner who plans six runs, misses half of them, and feels constantly tired.
A faster 5K comes from training that fits the person, not just the event. The most useful plan is one that can be sustained long enough to create adaptation.
More training isn't always better. Better training is about applying the right stimulus, recovering from it and consistently progressing over time.
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