I’ll never forget that day grinding up a brutal Bali trail—sweat pouring, legs burning—and suddenly, my lower back just gave out.
It was mile 10, and I thought I was in solid shape.
But turns out, I’d been skipping the one thing holding my whole stride together: core strength.
That day was a slap in the face.
A painful one. But it forced me to finally respect my core and what it actually does for us runners.
Hey, I’m David Dack.
I coach runners here in Bali—and if there’s one thing I’ve drilled into my own training and passed on to every runner I coach, it’s this: your core matters more than you think.
Sure, running more is the key to getting better at running. No argument there.
But ignore your core, and you’ll eventually pay for it—in sloppy form, slow times, or a trip to the physio.
Once I committed to real core work, things changed. My back pain vanished, my form tightened up, and I even shaved a few minutes off my half-marathon time.
These weren’t just minor gains—this was a shift in how my body handled mileage, especially when it mattered most: the late miles.
The truth?
Most runners skip core work. I get it.
For years, if I had 15 extra minutes, I’d run an extra two miles instead of dropping into a plank.
But now I know: those 15 minutes of core work can unlock more running gains than you’d think. That’s why I put together this guide.
Inside, you’ll find the 23 best core exercises I swear by—ones I’ve tested on myself and my athletes.
I’ll also share coaching tips, mini confessions (like how a move called the “dead bug” embarrassed me in the gym), and the no-BS reasons why this stuff works.
The 23 Best Core Exercises for Runners
Let’s Talk Core
Want to run smoother, stronger, and with fewer injuries?
Then stop skipping your core work.
A solid core holds your posture together when the miles stack up.
Below are 25 core exercises that I’ve used in my own training—and with athletes I coach—to build a midsection that actually holds up under pressure.
These aren’t just sit-ups for show.
This is about real, runner-specific strength.
Think planks, glute bridges, twisting drills, and dynamic movements that hit every angle. I’ve laid them out from basics to tougher ones, so start where you are and build up.
1. Plank
If I could force you to only do one core move, it’d be this.
The plank hits your abs, back, shoulders, glutes—pretty much your whole trunk. It’s simple but brutal.
I used to shake after 30 seconds. Now I can go longer, but it’s still not easy—it just gets more intense the stronger you get.
How to do it:
- Start face-down, elbows under shoulders, forearms flat.
- Lift into a straight line from head to heels.
- Squeeze your glutes, tighten your abs, breathe steady.
- Hold 30–45 seconds. Work your way up.
Coaching tip:
If you sag or pike, stop and reset. Short, clean holds beat long, sloppy ones.
Want to level up? Elevate your feet or lift a leg. Trust me—this pays off when your form stays tight at mile 20.
2. Side Plank
This move checks your side-to-side strength.
It hits your obliques and hip stabilizers—crucial for trails, turns, and keeping your knees aligned.
Most runners can’t hold this long at first (I couldn’t either).
How to do it:
- Lie on one side, elbow under shoulder.
- Stack feet or stagger for balance.
- Lift your hips into a straight diagonal line.
- Hold 20–30 seconds per side.
Coaching tip:
Struggling?
Try bending your bottom knee for a shorter lever. Don’t let your chest rotate or hips wobble.
To make it harder, do dips or lift the top leg (star plank). Side planks torch your obliques in the best way.
3. Balance Plank (Arm/Leg Extensions)
Add limb movement to your plank and you’ve got a full-body challenge. This teaches your core to stay stable when your limbs are doing different things—just like in running.
How to do it:
- Start in a push-up plank.
- Lift one arm out in front, hold 2 seconds.
- Return, then lift the other arm. Repeat with legs.
- Alternate arms and legs for 30–45 seconds.
Coaching tip:
Move slowly. Don’t rush. Control is everything.
If that’s too hard, drop to all fours (bird dog).
Want a real challenge? Lift opposite arm and leg together. That’s when your core really kicks in.
4. Russian Twists
Time to add some rotation.
Russian twists hit your obliques and challenge your balance. They mimic the torso rotation that happens subtly with every stride.
How to do it:
- Sit on the ground, lean back to 45 degrees.
- Feet up (or heels down to modify), hands clasped.
- Twist side to side, tapping the ground beside your hips.
Coaching tip:
Start light—don’t go heavy out the gate. I bruised my ego once going too hard with a medicine ball.
Focus on twisting your torso, not just flailing your arms. This move helped me feel more stable on uneven trails.
5. Superman
A strong core isn’t just abs—you need a strong back, too. This move targets the muscles along your spine, plus your glutes and shoulders.
How to do it:
- Lie face-down, arms extended overhead.
- Lift opposite arm and leg, hold 2–3 seconds.
- Lower and switch. Repeat for 10–12 reps per side.
Coaching tip:
Don’t go too high—control matters more than range.
If you’re feeling it in your low back, good. That’s where you need strength to stay tall in a race instead of folding forward.
6. Single-Leg Glute Bridge
Your glutes power your stride. This move builds strength and balance one leg at a time.
How to do it:
- Lie on your back, knees bent.
- Extend one leg up, drive through the opposite heel.
- Lift hips until your body forms a straight line.
- Lower and repeat 10–12 times, then switch sides.
Coaching tip:
Start with both feet down if needed. Push from your heel, not your back.
This move helped fix my IT band pain years ago—strong glutes changed the game.
7. Windshield Wipers
These build rotational strength and challenge your control. Go slow—this isn’t a race.
How to do it:
- Lie on your back, arms out in a T.
- Lift legs to tabletop (or straight for harder).
- Rotate slowly side to side, stopping before your shoulder lifts.
Coaching tip:
Control the motion. No swinging. Your core should pull your legs back to center.
Want more?
Straighten the legs or add a med ball between your feet. Your abs will light up.
8. Scorpion Plank
A more advanced move—this one adds a knee drive twist to a decline plank. It builds strength, mobility, and serious coordination.
How to do it:
- Feet elevated on a bench, hands on the ground.
- From a plank, drive one knee toward the opposite elbow.
- Return to plank, switch sides.
Coaching tip:
Keep hips low and tight. Don’t swing the leg—move with purpose.
I love these when I need to sweat fast and build rotational control. They’ll humble you quick, but the payoff is real.
9. Boat Pose (V-Sit)
Boat pose is basically a gut-check in disguise. You’re sitting on your tailbone, legs up, chest up, trying to stay balanced while everything in your core screams.
Runners often skip it, but they’re missing out.
This move hits the front and deep core hard—think rectus abdominis and transverse abdominis—and helps you lock in posture when you’re tired late in a run. I call it the seated cousin of the plank, but meaner.
I first tried it in a yoga class and barely lasted 15 seconds. My legs were shaking like I’d just run a downhill mile at race pace.
But the more I practiced it, the more I felt my upper and lower body working as a unit. That mind-muscle link carried straight into my runs.
How to Do It:
- Sit on the ground with knees bent, feet flat.
- Shift so you’re on your sit bones, chest lifted, back straight. Think “tall spine.”
- Arms reach forward at shoulder height—or keep hands on the floor for balance if you’re new.
- Lean back a bit while lifting feet off the floor. Shins parallel is a good starting point.
- Want more heat? Straighten your legs into a full “V” shape.
- Squeeze your core to hold. Start with 10 seconds, build to 30+.
Coach’s Tips:
If you feel your lower back take over, reset. Chest up. Draw your belly button in.
And if your legs shake? Good. That means you’re working.
For a boost, try light pulses or boat pose with a twist. Runners—do this 20–30 seconds at a time, a couple rounds.
It’s one of those sneaky moves that’ll make your uphill runs smoother.
10. Dead Bug
Don’t let the name fool you—dead bugs are sneaky strong.
This move teaches your core to brace while your limbs move, which is exactly what your body does while running. It’s a top pick for runners with low back pain or who struggle to activate their lower abs.
I made the rookie mistake of rushing through it when my PT gave it to me.
Thought it was too easy… until I slowed down, pressed my back into the floor, and felt the fire light up in my belly. Humbling, but effective.
How to Do It:
- Lie on your back, arms straight up, knees bent to 90 degrees.
- Flatten your lower back into the floor.
- Slowly lower your left arm and right leg, keeping your back glued to the ground.
- Return to center, then switch sides.
- Do 8–10 reps per side, moving slow and breathing with control.
Coach’s Tips:
No arching. No rushing. If you feel your back lift, you’ve gone too far—shorten the range.
Want a challenge?
Add ankle weights or a light dumbbell. But even bodyweight hits hard when done right.
I’ve had athletes knock out their low back pain with just five minutes of dead bugs a day. Start there.
11. Bird-Dog (Kneeling Extension)
Bird-dogs are like the ground version of running: opposite limbs moving while the core holds everything together. They’re easy to underestimate but crucial for fixing wobbly running form.
I add them to almost every warm-up, especially before trail runs. They switch on your balance and coordination without taxing your joints.
How to Do It:
- On hands and knees, keep back neutral.
- Extend left arm and right leg. Pause.
- Keep hips level—no wobbling.
- Return, switch sides. 5–8 reps per side.
Coach’s Tips:
Imagine a cup of coffee on your lower back. Don’t spill it.
Brace your abs, avoid arching, and stay slow.
Add a little twist by touching elbow to knee under your body for more challenge. I’ve seen these clean up hip dips and improve posture in just a couple weeks.
12. Bicycle Crunches
These are old-school, but they still bring the heat. Way better than regular crunches, because they hit your obliques, hip flexors, and rectus abdominis—all while getting your heart rate up.
In college, our coach had us do 100 of these after track sessions. I still hear him yelling, “twist, don’t flap!”
How to Do It:
- Lie on your back, hands lightly behind your head.
- Knees at 90 degrees.
- Twist to bring right elbow toward left knee while extending right leg.
- Switch sides. That’s one rep.
- Go for 15–20 per side.
Coach’s Tips:
Don’t yank your neck. Lead with the shoulder. Extend legs low only if your back stays flat. If your form slips, rest.
I use these to fire up my core before runs and sometimes finish a session with them.
Done right, you’ll feel the burn the next day.
13. Scissor Kicks
These will light up your lower abs and hip flexors—perfect for runners who want more power in their stride. Just don’t fake your way through them. They get tough fast.
I used to hate these in track practice, but now I love them. They target the part of the core that helps drive your knees forward with each stride.
How to Do It:
- Lie on your back, hands by your sides or under your hips.
- Legs hover 6 inches off the floor.
- Raise one leg up to 45 degrees, then switch.
- Keep alternating. Aim for 15–20 per leg.
Coach’s Tips:
Back flat. Don’t let it arch. Start with small kicks if needed.
For variation, try cross-body scissors.
I use these as a finisher. The burn is real, but the payoff on hills and sprints is worth it.
14. Donkey Kicks (Glute Kickback)
These aren’t just booty builders—they’re performance boosters. Your glutes are your power plant. Weak glutes = sloppy form and injury risk. Donkey kicks get them firing without stressing your knees.
When I started doing these consistently, I felt my stride tighten up and my knees stopped aching.
How to Do It:
- On all fours, core tight.
- Keep right knee bent and kick heel toward ceiling.
- Squeeze your glute at the top.
- Lower with control. Do 12–15 per leg.
Coach’s Tips:
Don’t twist your hips.
Don’t arch your back.
Imagine stamping the ceiling. Add a band or dumbbell behind the knee if you want more load. Strong glutes = happy knees and stronger finishes.
15. Glute Bridge
Simple, effective, and underrated. Glute bridges hit the backside while opening up your tight hip flexors. Runners who sit a lot? You need this.
This was one of the first drills I did to fix my underactive glutes—and it worked.
How to Do It:
- Lie on your back, knees bent, feet flat.
- Press through your heels and lift hips.
- Squeeze your glutes at the top.
- Lower slowly. 15–20 reps.
Coach’s Tips:
Don’t over-arch. Keep knees aligned. If hamstrings cramp, bring feet closer.
For more glute work, lift your toes. Add a band or weight on hips to progress.
I hold the last rep for 10 seconds for extra burn. Total game changer for posture and hill power.
16. Mountain Climbers
These are like sprinting in plank position. Great for core, cardio, and coordination. I love throwing them in as a finisher to simulate that end-of-race grind.
How to Do It:
- Start in high plank.
- Drive one knee in, then quickly switch.
- Keep back flat, hips steady.
- Go for 20–30 seconds.
Coach’s Tips:
Form first. No butt in the air, no hips sagging.
Start slow, build speed. Quiet feet = controlled movement. Cross-body versions hit obliques harder.
Want a challenge? Try these after your long run—feel that burn.
17. Swiss Ball Roll-Out
This one builds a steel-trap core. If you’ve ever done ab wheel roll-outs, this is the friendlier version. Perfect for runners who want better form control, especially on downhills.
I started with this after face-planting on an ab wheel. It taught me how to brace hard and move slow—skills that paid off big on trails.
How to Do It:
- Kneel with forearms on a Swiss ball.
- Brace core and roll ball forward.
- Keep hips from sagging.
- Roll back to start. Repeat 10–15 times.
Coach’s Tips:
Less is more—don’t overreach.
Neck neutral, back flat. You’ll feel the shake. That’s your deep core waking up.
Do this slowly, with control. You’ll start to notice your form staying tight when you’re tired on a run. That’s the goal.
18. Cross-Body Mountain Climber (Feet on Ball)
This move is like a plank-mountain climber combo on steroids. You’ve got your feet on a Swiss ball, doing cross-body knee drives.
Sounds simple. It’s not.
Your core gets smoked trying to keep you from rolling all over the place. And when you cross that knee to the opposite elbow? Boom—your obliques are lit.
Runners, this one is gold. It trains your core to brace while your limbs move wildly. Exactly what happens when you’re sprinting up hills or maneuvering tricky trails.
I didn’t touch this move until I had mastered standard ball planks and roll-outs. First time I tried it? Rolled off the ball like a clown. Took me weeks to stop face-planting. Worth it.
How to do it:
- Start in plank with your shins on a Swiss ball.
- Bring your right knee toward your left elbow (under your body). Place it back.
- Do the same with your left knee toward your right elbow.
- Alternate sides for 5–8 reps per leg. Control matters more than speed.
Coach Tips:
- Can’t control the wobble? Start with regular ball planks.
- Tuck your pelvis and squeeze your core. It protects your back.
- Spread your feet a little for more stability.
- A softer ball sometimes helps—it molds better.
19. Medicine Ball V-Up
This one brings the heat. A V-up is already spicy—but add a medicine ball and your abs are in for a rude awakening.
Think folding your body in half while holding a weighted ball. Total-body coordination, with a deep hit to your abs and hip flexors.
I love using these as a finisher. Just like pushing through the last 400m of a race.
How to do it:
- Lie on your back, med ball in hands overhead.
- Lift your torso and legs at the same time. Try to touch the ball to your shins.
- Lower slowly without letting your back arch.
- Do 8–12 reps.
Coach Tips:
- Use a light ball (4–6 lbs). Heavier isn’t always better.
- Exhale on the way up. Engage your core like you’re bracing for a punch.
- Bend your knees a bit if your hamstrings are tight.
20. Spider-Man Plank Crunch
Channel your inner superhero. This one has you in a plank, bringing your knee to the same-side elbow. It’s sneaky tough—your obliques and hips will feel it fast.
I like this one as a warm-up too. Opens up the hips, fires up the sides. Bonus: makes you feel cool.
How to do it:
- Get in a forearm or high plank.
- Bring your right knee out to your right elbow. Pause.
- Return and switch sides.
- Alternate 10 reps per side.
Coach Tips:
- Don’t rush. Slower is harder—and better.
- Keep your hips level. Don’t twist too much.
- Think of trying to touch your elbow—even if you can’t
21. Double Mountain Climber
Take your regular mountain climber and double the chaos. You jump both feet in toward your chest, then jump them back out. Kinda like a burpee’s cousin.
It’s intense. Core, quads, shoulders—all fired up. Great for runners needing quick power bursts.
How to do it:
- Start in high plank.
- Jump both feet forward under your chest.
- Jump them back to plank.
- Do 10–12 reps.
Coach Tips:
- Land softly. Don’t let your hips sag.
- Use your core to drive the knees in.
- Break it into sets if you’re gassed.
22. Jump Squats (with Core Focus)
Sure, these torch your legs. But your core? It’s what keeps you upright and safe on the landing.
Runners benefit big here. You get power, explosiveness, and better form under fatigue.
How to do it:
- Squat down.
- Explode up into a jump.
- Land softly into the next squat.
- Do 10–15 reps.
Coach Tips:
- Keep your chest up. Core tight.
- Don’t land like a tree falling—bend those knees.
- Too intense? Start with regular squats or add a small hop.
23. Plank with Alternating Arm and Leg Raise
Plank meets bird-dog. You lift opposite arm and leg at the same time and try not to tip over.
This is a true core stability test. And a humbling one. My first time, I fell over immediately. Took practice, but now it’s one of my go-to balance drills.
How to do it:
- Get into a push-up plank.
- Lift left arm and right leg. Hold 2–3 seconds.
- Lower, then switch sides.
- Do 6–8 reps per side.
Coach Tips:
- Wider feet make it easier.
- Don’t lift too high—aim for shoulder/hip level.
- Think “reach forward and back,” not “lift up.”
Final Thoughts:
You don’t need to do all of these at once.
Pick 4–5 and rotate them into your weekly routine. Focus on form, not how many reps you can hammer out.
A few years ago, I coached a group that added 15 minutes of core twice a week.
After two months, one runner knocked five minutes off her half marathon PR. Not because she ran more—but because she ran stronger.
Consistency wins. Quality matters. Your strong core is the glue that holds your running form together—especially when you’re tired.
So… start now. Pick a few. Try them. Stick with it.
And hey—why not hit a plank right now?