Written by

Gina Conley, MS

February 26, 2026

30-Minute Birth Prep Workout: Creating Space in Every Level of the Pelvis

Birth Preparation, Fitness, Prenatal

If you’re preparing your body for birth, one of the most powerful things you can focus on is creating space within the pelvis while maintaining strength and support. In this 30-minute birth prep workout I’ll walk you through a strategic combination of mobility and strength exercises designed to:

Open the top, middle, and bottom of the pelvis
Improve rib cage mobility in all three planes
Release tension in the pelvic floor
Support baby’s engagement and rotation
Help you feel more comfortable during pregnancy

This isn’t just about stretching. It’s about intentional movement that prepares your body for the biomechanics of birth.

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Why Creating Space in the Pelvis Matters

Your pelvis isn’t one static structure. It has multiple “levels” that baby must navigate during labor:

Pelvic Inlet (Top of the Pelvis) – Where baby engages
Upper & Lower Mid Pelvis – Where baby rotates
Pelvic Outlet (Bottom of the Pelvis) – Where baby emerges

Each level requires different hip positions, muscle engagement, and rib cage mobility. Pregnancy naturally shifts posture, often increasing spinal extension and tightening certain muscles (like the lats), which can limit space where it’s needed most.

The goal?
✔ Open when we need openness
✔ Strengthen the muscles that create that space
✔ Improve rib cage mobility to support pelvic positioning

Level 1: Opening the Top of the Pelvis (Pelvic Inlet)

What We’re Targeting:

External hip rotation (knees out)
Hip abduction (legs wider)
Front-to-back rib cage mobility
Quad and glute strength

Mobility: Deep Squat Therapy

Using a yoga block for support, begin in a relaxed deep squat. Elbows press gently into knees to create outward pressure.

This position:

Encourages external rotation
Opens the pelvis side-to-side
Helps baby engage

If ankle mobility feels restricted, elevate your heels with a mat or wedge.

Strength: Loaded Squats

Holding one or two dumbbells:

Inhale to lower
Exhale to stand
Maintain even weight through big toe and pinky toe

Squats strengthen the quads and glutes—the muscles that help pull the pelvis into a more open inlet position.

Rib Cage Mobility: Lat Release + Core Strength

Many pregnant bodies default to extension (arching). This can make it harder for baby to settle into the pelvis.

Lat Release

Using a wall or doorframe:

Hinge back
Press into the wall
Square chest to floor

Releasing tight lats makes it easier to find a rounded spinal position—key for creating space in the back of the inlet.

Core March (Pregnancy-Safe Core Work)

Holding weights in front:

March slowly
Maintain upright posture
Avoid leaning back

Strong, adaptable abdominal muscles support pelvic positioning without excessive strain.

Level 2: Upper Mid Pelvis (Baby Begins Rotation)

Now we shift to one-sided, externally rotated positions.

Mobility: Lateral Hip Shifts

Shift into one hip
Bring opposite hip toward knee (belly to thigh)
Feel stretch in groin and inner thigh

These movements create space in one side of the pelvis—important as baby rotates.

Add thoracic rotation for deeper impact. Remember:
Your rib cage and pelvis are connected through the spine.
Restriction in one affects the other.

Strength: B-Stance Squats (Ipsilateral Load)

Hold weight on the same side as the front leg.

This:

Biases external rotation
Targets glutes and quads
Strengthens muscles that open the upper pelvis

Then add banded open-chain hip rotation (mini band above knees) to strengthen hip rotation when the femur moves on a stable pelvis.

Both pelvic rotation and hip rotation matter.

Hip Rotation Drill

Now we layer in something slightly different.

Place a mini band above your knees:

Shift weight into your right foot.
Exhale to move your left knee out.
Inhale to return with control.
Switch sides.

This movement is hip rotation, not pelvic rotation.

Earlier movements like:

Lateral hip shifts
B-stance squats

Were pelvic rotation exercises (pelvis moving over a stable femur).

Now:

The pelvis stays anchored
The femur moves in the socket

Both are essential!

Why This Matters for Birth

When baby rotates, your body needs:

Strong external rotators
Single-leg stability
Controlled asymmetry

This open-chain band work strengthens the hip differently than planted exercises. It mimics the asymmetrical stability demands of upright labor positions.

It also prevents over-reliance on external rotation dominance — something many pregnant bodies default into.

Training both pelvic rotation and hip rotation improves coordination, space, and comfort.

Level 3: Lower Mid Pelvis (Internal Rotation for Baby’s Final Rotation)

This phase emphasizes closed hip positions and internal rotation.

Mobility: Hip Shifts

Stagger stance:

Weight into big toe
Slight tuck
Opposite hip moves toward knee

You should feel a stretch deep in the “hip pocket” (posterior hip).

These are incredibly helpful for:

Tailbone pain
SI joint discomfort
Tension in the back of the pelvic floor

Many people find these movements useful during labor, especially paired with deep vocalization.

Strength: Staggered Stance RDL (Contralateral Load)

Now we switch the loading pattern.

Weight in opposite hand of front leg
Hinge back
Knee stacked over ankle

This emphasizes:

Internal rotation
Hamstrings
Inner thighs

These muscles help create space in the lower pelvis.

Side-Lying Internal Rotation (Inner Thigh Strength)

In a side plank variation:

Top knee supported on block
Bottom leg lifts into internal rotation

This strengthens adductors and supports internal rotation—often undertrained during pregnancy.

During pregnancy, the inner thighs can become lengthened because we tend to favor more of an open position or externally rotated position.

Rib Cage Mobility: The Missing Link

Your rib cage needs to move:

Front to Back (flexion/extension)
Rotation
Side-to-Side (Lateral Expansion)

In 90/90 hip positions, add side-body reaches to improve lateral rib mobility.

Many people notice one side feels tighter. That asymmetry is common—and worth addressing.

Final Focus: Pelvic Outlet (Bottom of the Pelvis)

For the pelvic outlet, we emphasize:

Bilateral Internal Rotation + Hinges

Block between thighs:

Deadlifts (RDLs)
Knees stacked
Hips hinge back

Think: flashlight on your tailbone shining behind you.

Hinges:

Strengthen posterior chain
Create outlet space
Prepare you for pushing mechanics

Finishing Movement: Hero Pose Sit-Backs

In a kneeling internal rotation position:

Exhale, pull belly toward spine
Gently tuck pelvis
Sit back as tolerated

Focus on abdominal engagement—not glute clenching—to create a rounded spinal position.

The 7 Essential Birth Prep Movements

To truly prepare your pelvis for birth, your routine should include:

✔ Both legs externally rotated (open hips)
✔ Both legs internally rotated (closed hips)
✔ One leg open
✔ One leg closed
✔ Rib cage front-to-back movement
✔ Rib cage rotation
✔ Rib cage side-to-side mobility

When all seven are incorporated, you:

Create space in every level of the pelvis
Release pelvic floor tension
Support baby’s rotation
Reduce discomfort during pregnancy

And remember: Pain is not a requirement of pregnancy.

Want Structured Support?

MamasteFit offers:

Self-paced prenatal strength programs
Video-based follow-along prenatal workouts
Pelvic mechanics and professional education courses

Our programs sync with your current week of pregnancy and integrate mobility + strength intentionally.

You can use code YOUTUBE for 10% off their offerings.