10 Reasons Why Runners Should Strength Train

Should runners strength train? I get asked this question almost every week. And honestly, after 20+ years of coaching runners, my answer has never wavered: yes, runners absolutely should strength train, and the evidence backs it up completely.

Here's the thing. Most runners I work with come to me having avoided the gym for years. They worry it'll make them heavy, stiff, or too sore to run. I understand the hesitation. Running is your priority. You don't want anything to get in the way of your miles.

But the research is clear, and so is my experience coaching everyone from first-time 5K runners to Boston qualifiers. Strength training doesn't compete with your running. It makes your running better in almost every way that matters.

If you want a structured, coach-led programme that takes all the guesswork out of combining strength and running, check out Bulletproof Runners. It's built specifically for distance runners who want to train smarter, stay injury-free, and run faster without spending hours in the gym.

But first, let's cover the ten reasons why every runner should be lifting weights, backed by science and real-world coaching experience.

Quick Answer: Should runners strength train? Yes. Strength training improves running economy by up to 8%, reduces injury risk significantly, boosts speed, protects joints, and helps you run stronger for longer. Aim for 2 sessions per week, focused on compound lower-body and core movements.

What Is Strength Training for Runners?

Strength training for runners means using resistance, whether that's weights, bands, or your own bodyweight, to build the muscular strength and power your body needs to run well. It's not about bodybuilding. It's not about getting big. It's about making your muscles, tendons, and bones more resilient and more efficient.

A good strength training programme for distance runners focuses on the movements that directly support running: single-leg stability, hip strength, calf and ankle resilience, and core control. It complements your running rather than competing with it.

Done right, you're looking at two focused sessions per week of around 30 to 45 minutes each. That's it. The return on that investment is enormous.

Should Runners Strength Train? 10 Reasons the Answer Is Yes

1. It Improves Your Running Economy

Running economy is one of the biggest predictors of distance running performance, and strength training improves it significantly. Running economy simply means how much energy you use to hold a given pace. The more economical you are, the faster you can run for the same effort.

Multiple meta-analyses show that adding strength training to a running programme improves running economy by around 3 to 4% on average. Some individual studies have found improvements of up to 8%. That's a massive gain from two gym sessions per week.

The mechanism is partly neural. Your nervous system gets better at recruiting muscle fibres efficiently, so each stride costs you less energy. Your tendons also become stiffer and more elastic, storing and releasing energy like a spring with each footstrike.

Think about what a 4% improvement in running economy means in practice. For a runner currently finishing a marathon in 4 hours, that kind of efficiency gain could translate to several minutes off your finish time, without changing your training volume at all.

2. It Dramatically Reduces Your Injury Risk

Injury prevention is probably the single most compelling reason for runners to strength train. Running is a repetitive, high-impact sport. Every kilometre you run, each foot strikes the ground hundreds of times. Over a week of training, that adds up to millions of impacts across your joints, tendons, and muscles.

Strength training builds the structural resilience to absorb those loads without breaking down. Research consistently shows that strength training reduces overuse injury rates in runners by up to 50%. That's not a small effect. That's transformative.

I've seen this play out countless times with my athletes. The runners who skip the gym are the ones who end up with IT band syndrome, patellofemoral pain, or stress fractures. The ones who commit to two sessions a week rarely get sidelined.

If you've been struggling with a nagging injury, check out my guide to why runner's knee won't go away and how strength work fits into the solution. For older runners especially, the protective effect of strength training is even more pronounced. I've written more about this in my article on running injuries over 40.

3. It Makes You Faster

Strength training makes you faster, full stop. This surprises a lot of runners who think speed only comes from running more miles or doing track sessions. But your speed is limited by how much force you can apply to the ground with each stride, and that's a strength quality.

Studies on middle and long-distance runners consistently show that heavy strength training, particularly lower-body work like squats and deadlifts, improves time trial performance at distances from 1500m up to 10K and beyond. One study found a 4.6% improvement in 10K time after a 10-week heavy strength programme.

If you're chasing a faster 10K, adding strength work to your weekly routine is one of the most effective things you can do alongside your run training.

4. It Boosts Your Sprint Speed and Finishing Kick

Even distance runners need explosive power, whether that's surging past a competitor in the final mile, attacking a hill, or simply picking up the pace when it matters most. That explosive quality, what coaches call neuromuscular power, responds brilliantly to strength training.

Plyometric work and heavier compound lifts develop the fast-twitch muscle fibres that give you that finishing kick. I always include some plyometrics for distance runners in my programmes for this exact reason. Even a small improvement in neuromuscular power can make a meaningful difference when you're racing.

5. It Corrects Muscle Imbalances That Lead to Injury

Running is a single-leg sport, and most runners have significant strength imbalances they don't even know about. Your dominant leg does more work. Your glutes switch off. Your hip stabilisers get lazy. Over time, these imbalances create compensatory movement patterns that load your joints unevenly and set you up for injury.

Targeted strength work, particularly unilateral exercises like single-leg deadlifts, split squats, and single-leg bridges, exposes and corrects these imbalances in a way that running alone simply can't do.

I've written a dedicated piece on training your weaker side that goes deeper into this if you want to explore it further. The bottom line is that addressing imbalances is injury prevention work, and it pays dividends over a full season of training.

6. It Builds Stronger Bones

Stress fractures are one of the most devastating injuries a runner can suffer, and bone density is a key factor in whether you get one. Running does provide some bone-loading stimulus, but it's largely limited to one plane of movement and one type of loading.

Resistance training applies forces to your skeleton in multiple directions and at higher magnitudes, which is exactly the stimulus your bones need to remodel and become denser. Research shows that progressive resistance training significantly increases bone mineral density, particularly in the hip and spine, the two areas most vulnerable to stress fractures in runners.

This matters even more as you get older. Bone density naturally declines with age, and strength training is one of the most powerful tools we have to slow that process down.

7. It Strengthens Your Tendons and Connective Tissue

Most running injuries don't happen in the muscle belly. They happen in the tendons. Achilles tendinopathy, patellar tendinopathy, plantar fasciitis: all tendon-related problems that are extremely common in runners.

The good news is that tendons respond very well to progressive loading. Slow, heavy strength exercises, particularly calf raises for the Achilles and soleus strengthening exercises, directly stimulate tendon collagen synthesis and make your tendons more robust.

If you've ever dealt with plantar fasciitis, you'll know how debilitating it can be. Strengthening the calf complex and foot musculature through targeted resistance work is one of the best preventative strategies available. My ankle strengthening routine is a great starting point for this.

8. It Improves Your Posture and Running Form

Weak muscles don't just limit your power output. They let your running form fall apart when you're fatigued. If your core can't hold your pelvis stable, your hips drop. If your glutes aren't strong enough, your knees cave inward. If your upper back is weak, your shoulders round and your arm drive becomes inefficient.

All of these form breakdowns increase your injury risk and slow you down, especially in the later miles of a race or long run. Strength training builds the muscular endurance to hold good form when it counts most.

Core strength is particularly important here. But I'm not talking about endless crunches. I mean anti-rotation and anti-extension exercises that train your core to resist movement, which is exactly what it needs to do when you're running. The side plank is one of my favourite examples, and my 10-minute core workout for runners gives you a ready-made routine to follow.

9. It Helps You Maintain Muscle Mass as You Age

From our mid-30s onwards, we naturally lose muscle mass, a process called sarcopenia. For runners, this matters because muscle loss means less power, less stability, and a higher injury risk. Running alone doesn't provide enough stimulus to maintain muscle mass, especially as training volume increases and the body adapts.

Resistance training is the most effective tool we have to preserve and rebuild muscle tissue at any age. For masters runners in particular, this isn't optional. It's essential. I've seen runners in their 50s and 60s dramatically transform their running performance and resilience simply by adding consistent strength work to their week.

The key is progressive overload: gradually increasing the challenge over time so your muscles keep adapting. This is exactly the principle that underpins a well-designed strength training programme for runners.

10. It Makes Running Feel Easier

This one sounds almost too simple, but it's genuinely one of the most common things my athletes report after a few months of consistent strength training: running just feels easier.

When your glutes are firing properly, your hips are stable, your core is holding everything together, and your calves have real spring in them, every stride is more efficient. You're not compensating. You're not fighting your own body. You're just running, and it feels the way it's supposed to feel.

That's the real promise of strength training for runners. Not just the numbers on a watch, but the physical experience of running with strength and control.

How Often Should Runners Strength Train?

This is where a lot of runners get it wrong. They either try to do too much and end up too sore to run, or they do so little that they never see results.

My recommendation is two dedicated strength sessions per week for most distance runners. That's enough to drive meaningful adaptation without compromising your running quality. If you're in heavy marathon training, you might drop to one session per week during your peak mileage weeks and race taper.

I've written a full breakdown of how often runners should do strength and mobility exercises if you want the detailed rationale. The short version is: consistency over months beats intensity in any single week.

Timing matters too. Ideally, do your strength sessions on the same day as a run rather than on rest days, so you protect your recovery time. If you run in the morning, lift in the afternoon or evening. If you're short on time, my strength training for runners short on time guide shows you how to get effective work done in 30 minutes or less.

Will Strength Training Make Runners Bulky?

No. This is one of the most persistent myths in running, and I want to put it to rest definitively.

Getting "bulky" requires a significant calorie surplus, high training volumes of bodybuilding-style work, and often specific hormonal conditions. Distance runners don't tick any of those boxes. You're burning huge amounts of energy through your running. Your body has no interest in carrying unnecessary muscle mass.

What you will gain is lean, functional muscle in exactly the right places: your glutes, hamstrings, calves, and core. This adds very little body weight but makes an enormous difference to your running performance and resilience.

The runners I coach who commit to strength training don't look like bodybuilders. They look like athletes. There's a difference.

What About the Interference Effect?

The interference effect is a real but frequently overstated concern. The theory is that endurance training and strength training send conflicting signals to your muscles, potentially limiting adaptations from both.

In practice, for recreational and sub-elite runners, this effect is minimal when you manage your training sensibly. The key strategies are:

• Separate strength and hard running sessions by at least 6 hours where possible
• Don't do heavy leg strength work the day before a long run or key quality session
• Prioritise sleep and nutrition to support recovery between sessions
• Keep strength session volume moderate: 3 to 4 exercises, 3 sets each, is plenty

The interference effect becomes more relevant at very high training volumes, like professional athletes doing 100+ miles per week. For the vast majority of runners reading this, it's not a meaningful barrier.

The Best Strength Exercises for Runners

You don't need a complicated programme. The exercises with the biggest payoff for runners are mostly compound, lower-body movements that mirror the demands of running. Here are the categories I always prioritise:

Single-Leg Exercises

Running is a single-leg sport, so your strength training should reflect that. Split squats, single-leg deadlifts, and step-ups are my go-to choices. They build strength, stability, and balance simultaneously.

Hip and Glute Strength

Weak glutes are behind an enormous proportion of running injuries. Glute activation exercises, single-leg bridges, and lateral lunges are essential. I also love the glute medius exercises for hip stability during the stance phase of running.

Calf and Ankle Strength

Your calf complex, particularly the soleus, absorbs massive loads with every stride. Progressive calf raises, both straight-leg and bent-knee, are non-negotiable. Pair them with ankle strengthening work for a resilient lower leg.

Core Stability

As I mentioned earlier, core work for runners is about stability, not crunches. Planks, side planks, and the psoas march are all excellent choices. My core and balance training guide covers this in much more detail.

Multiplanar Movements

Running happens primarily in the sagittal plane (forwards and backwards), but your body needs to resist forces in all directions. Including multiplanar strength exercises builds the lateral and rotational stability that keeps you injury-free over a long season.

How to Fit Strength Training Into Your Running Week

Structure matters. Here's how I typically organise strength training within a runner's weekly schedule:

This is a template, not a rigid prescription. Your specific schedule will depend on your total training volume, race goals, and recovery capacity. But the principle holds: pair strength sessions with easier run days, and protect your quality sessions and long run.

If marathon training is your focus, my guide to strength training for marathon success gives you a more detailed periodisation approach across a full training cycle.

Should Beginner Runners Strength Train?

Yes, and arguably more than experienced runners. Here's why.

When you're new to running, your muscles, tendons, and bones are adapting to loads they've never experienced before. That adaptation takes time, and it's the period when you're most vulnerable to injury. Strength training accelerates that adaptation and builds a protective buffer around your joints before the mileage starts to climb.

Start simple. Bodyweight exercises are perfectly effective for beginners. My 15-minute bodyweight workout for runners is a great entry point that requires no equipment and builds the foundations you need.

As you get stronger and more confident, you can progress to adding load with dumbbells, barbells, or resistance bands. The resistance band routine for runners is another excellent option for training at home with minimal kit.

Strength Training for Runners: Periodisation Matters

One thing the competitors I've reviewed largely miss is the importance of periodising your strength training across a full running season. Your strength work shouldn't look the same in January base building as it does three weeks before a marathon.

Here's how I structure it with my athletes:

• Base phase: Higher volume, heavier loads, more variety. This is when you build your strength foundation. 2 to 3 sessions per week.
• Build phase: Moderate volume, maintained intensity, more running-specific movements. 2 sessions per week.
• Race-specific phase: Lower volume, maintained intensity, focus on power and single-leg stability. 1 to 2 sessions per week.
• Taper: Reduce to one short session, minimal fatigue, maintain neuromuscular activation.
• Post-race recovery: Light bodyweight work only, prioritise tissue recovery.

This periodised approach ensures your strength work supports rather than competes with your running at every stage of the training year.

Frequently Asked Questions

Should runners lift heavy or light weights?

Research strongly favours heavier loads for runners. Studies comparing heavy strength training (around 80 to 90% of one rep max) with lighter, higher-rep work consistently show that heavy training produces greater improvements in running economy and performance. You don't need to train like a powerlifter, but you do need to challenge yourself beyond what feels comfortable. Aim for 3 to 5 sets of 4 to 6 reps for your main compound lifts.

Should runners run before or after lifting weights?

For most runners, running before lifting is the better approach. Your run is your primary training goal, so you want to do it fresh. Lifting after a run, when your muscles are already fatigued, is fine for moderate-intensity strength work. The exception is if you're doing a very hard track session: in that case, give yourself at least 6 hours between the run and any lifting, or put the strength session on a different day entirely.

Can strength training replace rest days for runners?

No. Rest and recovery are non-negotiable. Strength training is a stimulus for adaptation, but the adaptation happens during rest. If you're replacing rest days with gym sessions, you're accumulating fatigue without giving your body time to rebuild. Pair strength sessions with running days to keep your rest days truly restful.

How long before I see results from strength training as a runner?

Initial neuromuscular improvements, where your nervous system gets better at recruiting muscle fibres, happen within 4 to 6 weeks. You'll often notice running feeling smoother and more controlled before you see any visible physical changes. Meaningful structural adaptations in muscle and tendon tissue typically take 8 to 12 weeks of consistent training to develop fully.

Is bodyweight training enough for runners, or do I need to use weights?

Bodyweight training is a great starting point and remains valuable for injury prevention and activation work. But for the performance benefits, particularly the improvements in running economy and speed, you'll eventually need to add external load. The research on running economy improvements is largely based on heavy resistance training. Progress from bodyweight to added resistance over time for the best results.

The Bottom Line: Should Runners Strength Train?

Every piece of evidence points in the same direction. Strength training makes you a better runner. It improves your economy, reduces your injury risk, makes you faster, and helps you run with better form for longer. The only runners who shouldn't strength train are the ones who enjoy getting injured and leaving performance on the table.

Two sessions per week. Compound lower-body movements. Progressive overload over time. That's the formula. It's not complicated, but it does require consistency and a structured approach.

If you want all of this laid out for you in a complete, coach-designed programme that tells you exactly what to do, when to do it, and how to fit it around your running, that's exactly what Bulletproof Runners delivers. It's the programme I've built for distance runners who are serious about staying healthy and running their best, without wasting time on gym work that doesn't serve their running goals.

The runners who strength train consistently are the ones who make it to the start line healthy, run strong through the finish, and come back season after season without the injuries that derail so many others. I want that for you. Start with two sessions this week, and you'll understand why I'm so convinced that strength training for runners is one of the best investments you can make in your running.