Beginner’s Guide: Creating a Weekly Strength Training Plan for Runners

Whether you’re training for your longest run yet or just trying to go further without breaking down, one thing’s clear - running alone isn’t enough.

Yes, logging miles matters. So do long runs, recovery days, and pacing. But if strength training isn’t part of your weekly plan, you’re leaving performance on the table and putting yourself at greater risk of injury.

Building strength isn’t about bulking up or hitting the gym five days a week. It’s about giving your body what it needs to go the distance: better posture, more power, and the resilience to handle whatever the road (or trail) throws at you.

In this guide, we’ll show you how to fit strength training into your running week - without wrecking your legs or overcomplicating things.

Will Lifting Weights Make Me Run Slower?

It’s a common fear that lifting will bulk you up and slow your pace.

But, you’re not training to become a powerlifter. You just want to run stronger, stay injury-free, and maybe even shave a few seconds off your splits.

So here’s what you need to know:

You won’t bulk up unless you’re trying to. Building serious muscle mass takes a lot of focused effort - heavy lifting, high volume, and eating in a calorie surplus.
Strength = Speed. Strength training helps you run faster and more efficiently by improving stride power, posture, and joint stability.
Tired legs? That’s down to poor scheduling - not lifting itself.

You’re not training to hit a 300lb deadlift. You’re training to feel strong at mile 12.

Do Runners Need to Lift Heavy to Get Strong?

You don’t need to lift like a powerlifter,but you do need to lift more than your body’s used to.

To build strength and stay injury-free, your muscles need progressive overload. That means either lifting a challenging (but manageable) weight, or moving a lighter load with intent and speed.

Bodyweight exercises can work in the beginning. But your body adapts fast. If you want to keep getting stronger, you’ll need to add resistance.

That’s where The55 Multi-Weight Sandbag comes in.

At max load, it hits around 44lbs (20KG) - but it’s fully adjustable, so you can start lighter and scale up as you get stronger. And because the weight shifts as you move, it hits your stabilising muscles in a way dumbbells and barbells don’t.

Not sure how much weight you should start with? We wrote a full guide on Choosing The Right Sangbag Weight for Your Fitness Level.

How Often Should Runners Strength Train?

Two strength sessions a week are the sweet spot for most runners.

That’s enough to build power, reinforce good movement patterns, and keep your body holding up when the miles start stacking up.

Here’s how to time it right:

Keep at least 48 hours between sessions so your body can actually recover and adapt.
Don’t lift the day before a key run (like speed work or long runs).
Keep intensity high, volume low - especially if you’re getting close to a race or big training effort.

And when you’re two weeks out from that longer-distance run? Dial things back:

Cut your strength work to about half the usual volume.
Keep the lifts sharp and purposeful - think explosive reps, not marathon sets.

How Should Runners Fit Strength Training Around Running?

Ideally, strength training should be done on its own, either on a non-running day or at least six hours apart from your run. That gives your body time to recover and lets you get the most out of both sessions.

But life doesn’t always work that way, and that’s fine.

If you need to double up, you can still see solid gains by doing strength work before or after a run, just avoid doing it right before hard sessions like intervals or long runs.

Short on time? Another approach is to add 10–15 minutes of focused strength work most days, either post-run or as a standalone.

Example Weekly Strength Training Plan for Runners

You don’t need a fancy periodised spreadsheet or a separate “leg day.” What you need is a weekly rhythm that complements your running - not competes with it.

Here’s how a balanced weekly strength training plan for runners could look:

Day	Focus
Monday	Easy run + Strength Session A (Lower body + core)
Tuesday	Rest or light mobility
Wednesday	Speed or tempo run
Thursday	Strength Session B (Upper body + power)
Friday	Easy run or cross-training
Saturday	Long run
Sunday	Rest or optional mobility/core circuit

A few key notes:

Strength after runs, not before. You don’t want tired legs before speed work.
Keep strength work short and focused. 30–40 minutes tops.
Add mobility when and where you can.

Strength Workout A: Lower Body & Core (Posture + Power)

This one’s all about building that strong, stable engine - glutes, hamstrings, core. It’ll help you hold form at mile 10, power uphill, and recover faster after hard runs.

Circuit x 3 rounds

Rest 60–90 sec between rounds.

Sandbag Front Squats – 10 reps
Boosts quad/glute strength, supports better knee tracking.
Sandbag Reverse Lunges – 6–8 reps each leg
Single-leg stability = fewer imbalances + better ground contact.
Sandbag Glute Bridge Hold (weighted) – 30 seconds
Lights up your posterior chain without loading the knees.
Plank with Sandbag Pull-Throughs – 10 reps
Anti-rotation core control = better posture, especially under fatigue.

Keep the weight moderate. You’re training strength and control, not chasing a deadlift PB.

Strength Workout B: Upper Body & Power (Drive + Coordination)

This session targets explosive movement, grip strength, and upper body control. All key when you’re pumping your arms up hills or sprinting to the finish.

Circuit x 3–4 rounds

Rest 60 sec between rounds.

Sandbag Clean & Press – 6–8 reps
Full-body power + upper-body drive. Mimics sprinting force.
Sandbag Bent-Over Rows – 10–12 reps
Postural strength to keep your chest up during runs.
Push-Up on Sandbag – 10–12 reps
Chest + triceps without overloading shoulders.
Sandbag High Pulls – 8 reps
Builds upper back explosiveness—great for arm drive.

Both sessions can be done in 30–40 minutes.

Want some more ideas? Check out these 7 At-Home Strength Training Exercises for Runners.

What to Expect in 4–6 Weeks

Stick to this plan twice a week, and you’ll start to notice:

Stronger, more powerful strides (especially on hills and sprint finishes)
Better posture late in runs (no more folding forward at mile 9)
Fewer injuries - thanks to stronger glutes, hips, and core
Quicker recovery between sessions, so you can train more consistently
A mental edge from knowing your body’s built to go the distance

Final Thoughts

You don’t need to overhaul your training. You just need to lift smart, stay consistent, and work with (not against) your running schedule.

Two focused strength sessions a week are all it takes to build power, prevent injury, and hold form when it matters most. Add a sandbag, and you’ve got everything you need.

Stronger strides and faster finishes are all on the other side of strength work.

Ready to Train Smarter?

If you’re serious about building strength that actually shows up in your stride, The55’s Multi-Weight Sandbag is built to keep up with your miles and your goals.