Planks get a lot of hype. They’re supposed to be the ultimate “core strength” exercise, simple, effective, and no equipment needed. But if you’ve ever dropped into a plank and felt your low back ache, your stomach bulge downward, or even pressure in your pelvic floor, you know it’s not always that simple.
So why do planks hurt your core? More importantly, how can you fix it so you actually get stronger instead of frustrated?
The Core Isn’t Just Abs (It’s a Team Effort)
Most people think of their “core” as just the six-pack abs. In reality, your core is a system made up of your:
- Diaphragm (your main breathing muscle)
- Deep abdominals (like the transverse abdominis, your natural “corset”)
- Pelvic floor muscles (the base of your core)
- Back muscles (stabilizers that keep you upright)
These muscles are designed to work together like a well-coordinated team. When one part of the system isn’t pulling its weight whether it’s weak, tight, or out of sync, the others have to overcompensate. That’s when planks go from “killer exercise” to just plain painful.
What’s Going Wrong in a Plank?
Here are some common reasons your core or pelvic floor protests during a plank:
- Bulging or Doming at the Midline
This can happen if you have diastasis recti (abdominal separation) or if your deep abs aren’t kicking in. Instead of supporting your belly, the pressure pushes outward. - Pelvic Floor Pressure or Leaking
If you feel heaviness in your pelvic floor or notice leaking during planks, your pelvic floor may not be coordinating with the rest of your core. The extra pressure has nowhere to go but down. - Low Back Soreness
If your abs and pelvic floor aren’t engaged, your back muscles take over. That’s when you feel strain instead of stability. - Holding Your Breath
A plank often turns into a breath-holding contest, but that creates pressure in your abdomen that pushes out on your abs and down on your pelvic floor.
How to Fix It
The key is not just pushing harder, but retraining your core system to work as a unit.
- Build from your breath: Use 360° breathing, inhale to expand through ribs and belly, exhale to gently engage your abs and pelvic floor.
- Start where your body is: Try wall planks, knee planks, or side planks until your core is strong enough for the full version.
- Watch your body’s feedback: Bulging, leaking, or heaviness are signs to adjust and not push through.
- Get expert guidance: A pelvic floor physical therapist can assess how your core and pelvic floor are coordinating, tailor modifications for your body, and guide you in progressing safely.
Why This Matters Beyond the Gym
Core and pelvic floor connection isn’t just about exercise, t’s about life. When these muscles are in sync, you have more support for:
- Picking up your kids (or heavy groceries)
- Running, jumping, and lifting without leaking
- Better posture and less back pain
- Confidence in moving your body without fear
When your core team works together you feel it everywhere, not just on the mat.
Bottom Line
If planks are leaving you with pain, bulging, or pressure, it’s not that you’re weak, it’s that your core system needs a little retraining. The good news? With the right strategy, you can rebuild your foundation, protect your pelvic floor, and actually enjoy the strength you’re building.👉 Ready to train smarter, not harder? At Pelvic Prescription, we help women (and men) reconnect their core and pelvic floor so exercise feels strong, not scary.
