Running isn’t just about racking up miles. If you want to run stronger, faster, and injury-free, functional strength training is non-negotiable.
Stronger muscles mean better efficiency, less fatigue, and fewer injuries holding you back. Skip the guesswork—this guide cuts straight to the best strength moves for runners, why they work, and how to fit them into your training.
Why Functional Strength Training is Essential for Runners
1. Prevents Common Running Injuries
Running is high-impact. Every stride sends force through your feet, ankles, knees, and hips. If your muscles aren’t strong enough to absorb the load, that force lands where it shouldn’t—leading to injuries like runner’s knee, shin splints, and IT band syndrome.
The problem? Most runners only focus on logging miles, not building the strength to handle them. Weak stabilizers and muscle imbalances make you more vulnerable to overuse injuries, especially as fatigue sets in.
Functional strength training reinforces the knees, hips, and ankles, giving your body the support it needs to handle repetitive impact without breaking down. More strength means more durability—so you can keep running instead of sitting on the sidelines.
2. Boosts Running Efficiency and Endurance
Running isn’t just about strong legs—it’s about how well your body uses energy. A stronger body moves more efficiently, reducing wasted effort with every stride.
Functional training improves VO2 max—your body’s ability to deliver oxygen to working muscles. The better your oxygen efficiency, the longer and harder you can run without hitting a wall.
It also strengthens core muscles, keeping your posture solid when fatigue sets in. A weak core leads to sloppy form, wasted movement, and unnecessary energy drain. A strong core? That’s the difference between finishing strong and fading fast.
3. Enhances Speed and Power
Speed isn’t just about how fast your legs move—it’s about how much force you can generate with each push-off.
Functional strength training builds explosive power, especially with plyometrics and resistance training. More power means stronger strides, better acceleration, and a faster top speed.
It also helps with endurance sprinting. As fatigue sets in, runners tend to lose form and slow down. Strength training reinforces posture and mechanics, helping you maintain speed even when your legs are screaming.
4. Supports Overall Mobility and Stability
Running isn’t just a straight-line movement—your body shifts and stabilizes with every step. If your stabilizer muscles aren’t strong, small inefficiencies add up, leading to wasted energy, slower times, and higher injury risk.
Functional training builds balance, agility, and mobility, helping you react to uneven terrain, maintain control on turns, and stay efficient over long distances. Strong stabilizers keep everything aligned and moving smoothly, reducing unnecessary strain on your joints.
Strength training isn’t optional if you want to run your best. It’s the foundation for endurance, speed, injury prevention, and long-term performance. Train smarter, run stronger, and keep pushing forward.
How to Train Functional Strength for Running Performance
Runners don’t need bodybuilding splits or endless machine reps. You need functional strength—power, stability, and mobility that translate directly to your stride. Every step you take is a mix of force, balance, and coordination. Train like it.
Focus on Injury Prevention
Most running injuries don’t happen overnight. They build up over time—weak stabilisers, poor mobility, and imbalances stacking up until something gives. The best way to stay injury-free? Strengthen the weak links before they become a problem with injury prevention and rehabilitation strategies.
Glutes, core, hamstrings, and hip stabilisers take a beating with every run. If they’re not strong enough to handle the load, your knees, ankles, and lower back pick up the slack. That’s when injuries strike. Prioritise glute activation, core engagement, and joint mobility.
Mobility work is just as important as strength. If your hips are locked up or your ankles don’t move well, you’ll compensate somewhere else—and compensation leads to breakdown. Add dynamic stretches, hip openers, and ankle mobility drills to your routine. Your joints will thank you.
Train the Right Muscles for Running
Not all strength training is created equal. Doing endless bicep curls or bench presses won’t make you a better runner. Your focus should be on functional movements that mimic the demands of running—powerful strides, strong landings, and efficient energy transfer.
Glutes are your engine. A weak posterior chain leads to sluggish strides and wasted effort. Core muscles keep your torso stable and prevent energy leaks, so you don’t wobble or over-rotate with every step. Single-leg strength is crucial because running is just a series of single-leg landings.
Skip the generic gym routine. Build a programme that reinforces real running mechanics—explosive push-offs, controlled landings, and strong posture from start to finish.
Use a Variety of Training Methods
Running isn’t one-dimensional, so your strength training shouldn’t be either. Mix it up.
Bodyweight exercises improve control and stability. Resistance bands activate small stabilisers that get overlooked in traditional lifting. Free weights build real-world strength, forcing your body to balance and engage multiple muscle groups at once. Plyometrics teach your legs to generate power and absorb impact—key for sprinting, uphill climbs, and strong finishes.
Training through different planes of motion makes you more adaptable. Running happens in a forward plane, but your body constantly makes micro-adjustments laterally and rotationally. If you only train in straight lines, you’re missing a key part of injury prevention and performance.
Prioritise Unilateral Strength Training
Every stride is a single-leg movement. If one side is weaker, tighter, or less stable than the other, you’ll compensate—and compensation leads to inefficiency, slower times, and injuries.
Unilateral training forces each leg to work independently, exposing and correcting imbalances. Exercises like single-leg deadlifts, Bulgarian split squats, and step-ups improve strength, stability, and coordination.
The stronger and more balanced each leg is, the more powerful, controlled, and efficient your stride will be.
Don’t Skip Stretching and Mobility Work
Strength training makes you stronger. Mobility work makes you move better. Ignore it, and you’re setting yourself up for tight hips, stiff ankles, and limited range of motion—things that kill efficiency and increase injury risk.
Pre-run, focus on dynamic warm-ups to activate muscles and increase blood flow. Think leg swings, hip circles, and lunges with a twist. Post-run, switch to static stretching and foam rolling to release tight muscles and improve recovery.
Functional strength training isn’t just about lifting weights—it’s about building a body that moves well, resists injury, and performs at its best. Train smart, stay strong, and keep running.
How Often Should Runners Strength Train?
Strength training is a game-changer for runners, but how much is enough? The right amount depends on your experience level, training goals, and overall mileage. Too little, and you miss out on key benefits like injury prevention, improved endurance, and better running mechanics. Too much, and you risk fatigue, poor recovery, and burnout.
The key is finding the right balance between running and strength work—building power without compromising performance.
Beginners: 2x per week for injury prevention
If you’re new to strength training, start with two sessions per week. This is enough to strengthen the key muscles used in running—glutes, core, hamstrings, and stabilisers—without overloading your body.
Focus on fundamental movement patterns:
- Lower body strength: Squats, lunges, and deadlifts to build strong, resilient legs.
- Core stability: Planks, dead bugs, and anti-rotation exercises to keep your posture solid.
- Mobility work: Hip openers and ankle mobility drills to improve range of motion.
The goal at this stage isn’t lifting heavy—it’s building a foundation. Stick to full-body workouts that complement your running without causing excess fatigue.
Intermediate/Advanced: 3-4x per week for performance gains
If you’re an experienced runner or aiming for performance improvements, step it up to three to four strength sessions per week. At this level, your body needs more than just injury prevention—you need power, stability, and endurance to run faster, longer, and more efficiently.
Your training should include:
- Heavy strength work: Squats, deadlifts, and step-ups to develop force production.
- Plyometrics: Explosive movements like box jumps, broad jumps, and plyo lunges to improve speed and power.
- Unilateral training: Bulgarian split squats and single-leg deadlifts to correct imbalances and improve stability.
- Core and mobility: Strength and flexibility work to maintain posture and reduce energy leaks.
At this stage, plan your sessions around your running schedule. Avoid heavy lifting the day before key runs, and prioritise lighter strength work on high-mileage weeks.
Peak Training: Adjust based on mileage—reduce volume but maintain strength
During peak race training or high-mileage blocks, strength training should support your running, not interfere with it. This is when you reduce the volume but keep the intensity.
- Drop to 1-2 sessions per week focusing on maintenance rather than progression.
- Prioritise lighter weights, mobility, and activation work over heavy lifting.
- Avoid muscle fatigue that could impact key sessions like speed work or long runs.
At this stage, the goal isn’t to build new strength—it’s to keep the body strong and resilient while prioritising running performance.
Should You Run or Lift First?
Strength training and running both demand energy, but the order you do them in depends on your goal. Get it wrong, and you risk fatigue, subpar workouts, or even increased injury risk. The key is understanding which priority comes first and how to structure your training so that both elements work together, not against each other.
If Running Performance is the Goal → Run First, Lift After
If you’re training for a race, working on speed, or simply aiming to improve your overall running performance, running should come first. Running is a high-skill, endurance-based activity that requires fresh legs and full energy reserves. If you strength train beforehand, you’ll go into your run with fatigued muscles, leading to slower paces, compromised form, and an increased risk of injury.
Here’s how to structure your session:
- Start with a quality run session—whether it’s speed work, a long run, or an interval session.
- Follow up with strength work, but keep it low to moderate intensity to avoid over-fatiguing the muscles.
- Prioritise mobility and core exercises to reinforce good running posture and prevent stiffness.
If your goal is to run at your best, lifting first could hold you back. Instead, think of strength work as supporting your running, not draining your energy before key sessions.
If Strength is the Goal → Lift First, Run After
If your primary focus is building strength, power, or muscle, then strength training should come first. Lifting heavy requires full-body coordination, maximal effort, and proper technique—things that become much harder if you’ve just drained yourself on a run.
Running before lifting can lead to:
- Reduced strength output due to pre-fatigued muscles.
- Weaker form during key lifts like squats and deadlifts.
- Higher risk of injury, especially when lifting heavy.
For a strength-first approach, structure your session like this:
- Start with strength training, focusing on compound lifts and explosive movements.
- Follow up with a short run, but keep it easy to moderate—no sprint sessions after heavy lifting.
- Prioritise recovery and stretching to prevent tightness and fatigue carrying over into the next day’s session.
This approach works best if your main goal is building strength or power, rather than prioritising running performance.
The Best Approach: Strength Train on Non-Running Days or After Easy Runs
The most effective way to balance both? Strength train on non-running days or after easy runs. This ensures that you’re not overloading your body or compromising either workout.
Here’s how to plan your week:
- Alternate running and strength days when possible.
- Combine easy runs with strength training—since neither demands maximal effort, they won’t interfere with each other as much.
- Avoid heavy lifting before key runs like speed work or long runs.
At the end of the day, it’s about balance. Running and strength training should complement each other, not compete. Structure your sessions wisely, listen to your body, and train in a way that supports your goals.
The 6 Best Functional Strength Training Exercises for Runners
Running isn’t just about your legs—it’s a full-body effort. Functional strength training strengthens the muscles that keep you moving efficiently, absorb impact, and reduce the risk of injury. These six exercises target power, stability, mobility, and endurance, helping you run stronger for longer.
1. Plyometric Lunges – Builds Explosive Power and Endurance
Why it matters: Running is a series of powerful, single-leg push-offs. Plyometric lunges mimic that motion while increasing lower body strength, power, and endurance. They also improve your ability to absorb impact, which reduces stress on your joints.
How to do it:
- Start in a lunge position with one foot forward and the other foot behind.
- Explode upward, switching legs mid-air, and land softly in a lunge with the opposite foot forward.
- Keep your core engaged and land with control to avoid excessive knee strain.
- Perform 3 sets of 12 reps per leg.
Pro tip: If you’re new to plyometrics, start with reverse lunges to build strength and stability before adding the jump.
2. Dead Bugs – Strengthens Core Stability for Better Posture
Why it matters: A strong core keeps your posture upright, prevents excessive rotation, and improves overall running efficiency. Weak core muscles lead to energy leaks, wasted movement, and poor form, especially during long runs.
How to do it:
- Lie on your back with your arms extended toward the ceiling and knees bent at 90 degrees.
- Slowly lower your right arm and left leg toward the floor while keeping your lower back pressed against the ground.
- Return to the starting position and switch sides.
- Perform 3 sets of 10 reps per side.
Pro tip: If your lower back arches off the ground, focus on engaging your deep core muscles before progressing to full reps.
3. Single-Leg Deadlifts – Improves Balance, Hamstring Strength, and Injury Resilience
Why it matters: Running is a single-leg movement. Single-leg deadlifts improve balance, strengthen the hamstrings and glutes, and reinforce stability—key for preventing injuries like hamstring strains and knee pain.
How to do it:
- Stand on one leg, holding a dumbbell or kettlebell in the opposite hand.
- Hinge at the hips, lowering the weight toward the ground while extending your other leg straight behind you.
- Keep your back straight and core engaged.
- Return to the starting position and switch sides.
- Perform 3 sets of 8-10 reps per leg.
Pro tip: Struggling with balance? Start by holding onto a wall or performing bodyweight reps before adding weight.
4. Hip CARs (Controlled Articular Rotations) – Enhances Hip Mobility for a Smoother Stride
Why it matters: Tight hips restrict your stride, limit power output, and increase injury risk. Hip CARs improve mobility, joint control, and movement efficiency, keeping your stride smooth and strong.
How to do it:
- Stand tall and lift one knee toward your chest.
- Rotate your hip outward, then sweep your foot behind you in a controlled motion.
- Reverse the movement back to the starting position.
- Perform 3 slow, controlled reps per leg.
Pro tip: Keep your torso still—only your hip should be moving. This ensures you’re actually improving mobility, not just compensating with your back or knees.
5. Side Planks – Core and Oblique Strength for Better Running Form
Why it matters: Side planks target the obliques and deep core muscles, which stabilise the pelvis and prevent excessive side-to-side movement while running. A strong core keeps your posture upright and improves energy transfer with each step.
How to do it:
- Lie on your side with your elbow under your shoulder and feet stacked.
- Lift your hips off the ground, creating a straight line from head to heels.
- Hold for 30-45 seconds per side, keeping your core engaged.
- Repeat 2-3 times per side.
Pro tip: Want to make it harder? Lift your top leg slightly to challenge your stability.
6. Renegade Rows – Upper Body and Core Engagement to Prevent Fatigue
Why it matters: While running is mostly lower-body dominant, your upper body plays a key role in maintaining posture and reducing fatigue. Weak arms, shoulders, and back muscles lead to poor running mechanics, especially on long runs. Renegade rows strengthen the upper body while reinforcing core stability.
How to do it:
- Get into a high plank position with a dumbbell in each hand.
- Keeping your body still, row one dumbbell up toward your ribs.
- Lower the weight and switch sides.
- Perform 3 sets of 8 reps per side.
Pro tip: Avoid twisting your torso. The goal is to keep your core engaged and resist rotation, just like when running.
The 6 Best Injury Prevention Exercises for Runners
Injury prevention isn’t just about stretching—it’s about building strength where it matters. Weak glutes, unstable hips, and poor core control lead to compensations, poor running mechanics, and eventual breakdown. These six exercises target the key muscles that keep you running strong, reduce stress on your joints, and prevent overuse injuries.
1. Reverse Lunges – Targets glutes and quads to support knee stability
Why it matters: Running puts a lot of strain on the knees, especially if your glutes and quads aren’t strong enough to absorb impact. Reverse lunges build strength and stability, helping to prevent knee pain and runner’s knee.
How to do it:
- Stand tall with your feet hip-width apart.
- Step one foot back into a lunge, lowering until your front thigh is parallel to the ground.
- Push through your front foot to return to standing.
- Perform 3 sets of 10 reps per leg.
Pro tip: Keep your weight in your front heel to activate the glutes instead of overloading the knee.
2. Single-Leg Deadlifts – Reduces lower back strain and strengthens hamstrings
Why it matters: Running is a single-leg movement, yet many runners neglect unilateral training. Weak hamstrings and poor hip stability lead to lower back strain, tightness, and hamstring pulls. Single-leg deadlifts build balance, control, and strength where you need it most.
How to do it:
- Stand on one leg, holding a dumbbell in the opposite hand.
- Hinge at your hips, lowering the weight toward the ground while extending your free leg behind you.
- Keep your back straight and return to standing.
- Perform 3 sets of 8 reps per leg.
Pro tip: If you struggle with balance, start with bodyweight reps or hold onto a wall for support.
3. Bird Dogs – Improves core control and balance
Why it matters: A weak core leads to poor posture, excessive movement, and wasted energy while running. Bird dogs improve core engagement, spinal stability, and balance, all of which help maintain good form on long runs.
How to do it:
- Start on all fours, with your hands under your shoulders and knees under your hips.
- Extend your right arm and left leg simultaneously, keeping your torso still.
- Hold for a second, then return to the start.
- Switch sides and repeat. Perform 3 sets of 10 reps per side.
Pro tip: Avoid arching your lower back—keep your core tight and your movements controlled.
4. Side Planks – Strengthens obliques and prevents lower back pain
Why it matters: Runners with weak obliques often develop hip drop, uneven strides, and lower back pain. Side planks reinforce core strength, lateral stability, and endurance, keeping you aligned and moving efficiently.
How to do it:
- Lie on your side with your elbow directly under your shoulder.
- Lift your hips off the ground, creating a straight line from head to heels.
- Hold for 30-45 seconds, then switch sides.
- Perform 2-3 rounds per side.
Pro tip: Make it harder by lifting your top leg or adding a side crunch.
5. Clamshells – Activates glutes and reduces knee and hip injuries
Why it matters: Weak glutes are a leading cause of knee, hip, and IT band injuries in runners. Clamshells activate glute medius—the muscle responsible for hip stability and knee alignment. If your knees collapse inward when you run, this exercise is a must.
How to do it:
- Lie on your side with your knees bent and feet together.
- Keeping your feet touching, open your top knee while keeping your hips stacked.
- Lower back down slowly.
- Perform 3 sets of 12 reps per side.
Pro tip: Add a resistance band around your knees for an extra challenge.
6. Bridges – Strengthens posterior chain for better running posture
Why it matters: Strong glutes and hamstrings keep your hips stable, prevent lower back pain, and improve running posture. Bridges reinforce your posterior chain, making each stride more powerful and efficient.
How to do it:
- Lie on your back with your knees bent and feet flat on the floor.
- Press through your heels, lifting your hips toward the ceiling.
- Squeeze your glutes at the top, then lower back down.
- Perform 3 sets of 12 reps.
Pro tip: Make it harder by lifting one leg or placing your feet on an elevated surface.
Functional strength training isn’t just an add-on—it’s essential for runners.
Running alone won’t bulletproof your body. Strengthening the right muscles improves endurance, speed, and resilience, keeping you injury-free and performing at your best.
The good news? You don’t need a gym full of machines to build functional strength. The55 Sandbag gives you everything you need for real-world, full-body training. Unstable loads challenge your stabilisers, dynamic movements improve power and endurance, and adjustable weight keeps you progressing.
Whether you're working on single-leg strength, core stability, or explosive power, the sandbag delivers.
Whether you’re training for a marathon or just want to run pain-free, start incorporating these exercises into your routine.
Grab a sandbag, get stronger, and see the difference on your next run. No excuses.
FAQs:
Is functional training good for runners?
Yes, functional training is great for runners. It builds strength, improves stability, enhances endurance, and reduces injury risk by targeting key muscles used in running.
Does strength training help prevent running injuries?
Yes, strength training helps prevent running injuries by correcting muscle imbalances, improving joint stability, and reinforcing key areas like the glutes, core, and hamstrings. Stronger muscles absorb impact better, reducing stress on joints and lowering injury risk.
What is the 6 12 25 rule?
The 6-12-25 rule is a high-volume strength training method designed to build muscle endurance and hypertrophy. It involves performing:
- 6 reps of a heavy compound movement
- 12 reps of a moderate-weight exercise
- 25 reps of a lighter isolation exercise
This method targets different muscle fibres, increases time under tension, and pushes muscular endurance—great for runners looking to build strength without excess bulk.
Why is strength training important for runners?
Strength training is important for runners because it improves power, endurance, and efficiency while reducing the risk of injury.
It strengthens key muscles like the glutes, core, and hamstrings, enhances joint stability, and helps maintain good running form, especially when fatigue sets in.
Stronger muscles also absorb impact better, reducing stress on the knees and ankles.