Runners spend enormous effort on legs and lungs and often almost none on the core — which is a shame, because your core is what holds the whole running machine together. Every stride sends force up through your body, and it’s the deep core that keeps your pelvis and torso stable so that force drives you forward instead of leaking sideways into wasted motion and overloaded joints. The moment most runners feel the cost of a weak core is late in a run or race, when form falls apart, the hips start to sag, and the stride gets sloppy — which is precisely when injuries tend to strike. Building genuine core stability is one of the highest-return, lowest-glamour things a runner can do.
Key takeaway: A strong, stable core keeps your pelvis and torso steady through every stride, preserving form as you fatigue and protecting your hips, knees, and back. For runners, stability and endurance of the deep core matter more than crunch-style strength. Two to three short sessions a week of anti-rotation and single-leg work is enough.
The best core exercises for runners build stability and anti-rotation control rather than crunch strength: planks and side planks, dead bugs, bird dogs, and single-leg work that challenges pelvic control, all underpinned by deep transverse abdominis and glute activation. These mimic the demands of running and keep your form intact as you tire. Two to three short sessions a week is enough. Sophie Mercer, PMA-certified clinical Pilates instructor, built a 10-week Pilates program for Marathon Runners of 36 exercises around exactly this kind of running-specific stability.
Why core strength matters so much for runners
Picture running as a controlled fall, repeated thousands of times. With each footstrike, force travels up your leg and into your trunk, and rotational forces try to twist your pelvis and torso. Your core’s job is to resist all that — to keep your centre stable so your legs can do their work efficiently. When the core is strong, energy transfers cleanly into forward motion. When it’s weak, the pelvis drops and rotates, the stride becomes inefficient, and the load that should be shared across a stable system gets dumped onto your hips, knees, and lower back. That’s the difference between a core that protects you and one that quietly sets you up for injury.
The best core exercises for runners
Forget endless crunches — running demands stability and anti-rotation, not the ability to repeatedly flex your spine. The exercises that transfer to running are the ones that train your core to resist movement and control your pelvis on one leg:
- Planks and side planks: build the all-round trunk stability and lateral strength that keep your pelvis level.
- Dead bugs: train the deep core to stay engaged while your arms and legs move — exactly the coordination running demands.
- Bird dogs: challenge anti-rotation and link the core to the glutes.
- Single-leg work: since running is a series of single-leg stances, balance and pelvic control on one leg is hugely specific and valuable.
Underpinning all of these is deep transverse abdominis and glute activation — the foundation that the bigger movements rely on.
How often should you do core work?
You don’t need much — two to three sessions a week of 15 to 20 minutes is plenty for most runners. Slot it onto easier running days or after a run, rather than before a hard session when you want fresh legs and a fresh core. The golden rule is consistency: short, regular core work sustained over months will transform your running far more than occasional marathon core sessions you can’t keep up.
Will it make you faster?
Honestly, core work rarely makes you faster on its own. What it does is make you more efficient and more durable — and those usually show up as better performance, especially in the back half of longer runs and races. By holding your form together as you fatigue and reducing the energy you waste on instability, a strong core helps you maintain pace when others are falling apart. Just as importantly, it keeps you healthy enough to train consistently, and consistent training is what actually builds speed.
Where Pilates fits for runners
Pilates is, at its heart, deep-core and stability training — which makes it almost tailor-made for runners. It develops exactly the qualities running demands: a stable pelvis, an engaged deep core that holds under fatigue, balanced single-leg control, and strong glutes. Rather than bolting on a few random core moves, a running-specific Pilates programme builds these systematically and progressively, so the strength you build genuinely shows up in your stride.
How the Marathon Runners protocol helps
Sophie’s 10-Week Pilates Program for Marathon Runners develops the running-specific core and hip stability that protects your form over the miles — 36 exercises progressing toward the demands of distance running. If you want a core that holds together at mile 20 instead of falling apart, this is the structured way to build it.
This article is for informational purposes only and does not constitute medical advice. If you have a current running injury or pain, please consult a physiotherapist or doctor before starting a new exercise programme.