Pregnant and wondering if you can keep running? For most women, the answer is yes. Here's how to do it safely.

Is Running Safe During Pregnancy?

The Short Answer

Yes, for most women with uncomplicated pregnancies.

The American College of Obstetricians and Gynecologists (ACOG) recommends:

• 150 minutes of moderate-intensity aerobic activity per week
• Throughout pregnancy, if no complications
• Running specifically is considered safe for women who ran before pregnancy

Benefits of Running While Pregnant

For you:

• Reduced risk of gestational diabetes
• Lower risk of preeclampsia
• Better mood and reduced anxiety
• Improved sleep
• Easier labor and faster postpartum recovery
• Maintained fitness for return to running

For baby:

• Healthy birth weight
• Better stress tolerance
• No increased risk of complications (in uncomplicated pregnancies)

When You Shouldn't Run

Absolute contraindications (do not run):

• Placenta previa after 26 weeks
• Preterm labor or ruptured membranes
• Preeclampsia or pregnancy-induced hypertension
• Severe anemia
• Certain heart or lung conditions
• Incompetent cervix

Relative contraindications (discuss with provider):

• History of preterm birth
• Unexplained bleeding
• Twins/multiples
• Poorly controlled conditions (diabetes, hypertension, thyroid)

Always get clearance from your healthcare provider.

First Trimester (Weeks 1-13)

What's Happening

Your body:

• Hormone surges (hCG, progesterone)
• Blood volume increasing
• Heart rate elevated at rest
• Fatigue often peaks

Common challenges:

• Exhaustion
• Nausea
• Breast tenderness
• Frequent urination

Running in First Trimester

The good news: You can often run normally, especially early on.

The reality: Fatigue and nausea may derail plans.

Approach:

• Run when you feel up to it
• Skip runs when you don't—guilt-free
• No need to increase mileage
• Keep easy runs easy

Modifications

Pace: Slow down if needed. Your resting heart rate is already elevated.

Duration: Shorter runs are fine. 20 minutes counts.

Timing: Morning runs may avoid nausea. Or afternoon if mornings are rough.

Hydration: Start hydrating more than usual. You need extra fluid.

Racing in First Trimester

Can you race? Many women do, especially before showing.

Should you? Consider:

• How competitive do you want to be?
• Are you comfortable with unknown risks?
• Can you back off if something feels wrong?

Recommendation: Race if you want, but treat it as a training run, not a PR attempt.

Second Trimester (Weeks 14-27)

What's Happening

Your body:

• Belly growing visibly
• Center of gravity shifting
• Ligaments loosening (relaxin hormone)
• Blood volume up 30-50%
• Often feel better than first trimester

Common challenges:

• Round ligament pain
• Balance changes
• Overheating more easily
• Bathroom needs increasing

Running in Second Trimester

The sweet spot: Many women feel their best running in the second trimester. Nausea fades, energy returns, but belly isn't huge yet.

Approach:

• Continue running as comfortable
• Expect pace to slow
• May need to reduce mileage
• Focus on effort, not speed

Modifications

Belly band: Consider supportive wear. Round ligament pain responds well to compression.

Route selection: Flat, predictable surfaces. Your balance is changing.

Heat management: You overheat more easily. Avoid hot conditions, run early or late.

Pelvic floor: Some women experience pressure or leaking. Pelvic floor exercises help.

Common Second Trimester Issues

Round ligament pain:

• Sharp pain on sides of belly
• Usually with sudden movements
• Belly band helps
• Slow down if it occurs

Side stitches:

• More common as uterus grows
• Slow down, breathe deeply
• Try different meal timing

Braxton Hicks:

• Practice contractions—normal
• If they come during running, slow down or stop
• Should subside with rest

Third Trimester (Weeks 28-40)

What's Happening

Your body:

• Maximum belly size
• Significant weight gain
• Joints loosest (relaxin peaks)
• Breathing harder (baby pushing on diaphragm)
• Fatigue returning

Common challenges:

• Difficulty breathing deeply
• Back pain
• Hip pain
• Pelvic pressure
• Bathroom every 20 minutes
• Trouble sleeping

Running in Third Trimester

Reality check: Many women stop running or significantly reduce it. That's okay.

If you continue:

• Expect significant slowdown
• Walking breaks are normal
• Some days running won't work
• Listen carefully to your body

Common adaptations:

• Run/walk
• Shorter distances
• More frequent rest days
• Indoor treadmill for bathroom access

Modifications

Support: Belly band almost essential. Some use two.

Surfaces: Flat only. Falls are more dangerous and more likely.

Duration: Short runs. 15-20 minutes may be plenty.

Walking: Walking is a perfectly valid alternative. Walking counts.

When Third Trimester Running Gets Hard

Signs it's time to stop or modify:

• Pelvic floor pressure that doesn't resolve
• Hip or back pain that worsens
• Contractions that don't stop with rest
• Any bleeding or fluid leakage
• You just don't want to anymore

Alternatives:

• Walking
• Swimming (often feels amazing)
• Prenatal yoga
• Stationary cycling

When to Stop Running

Stop Immediately and Call Your Provider If

• Vaginal bleeding
• Fluid leaking from vagina
• Regular, painful contractions
• Chest pain
• Dizziness or faintness
• Severe headache
• Calf pain or swelling (could indicate blood clot)
• Decreased fetal movement

Signs to Slow Down or Take a Day Off

• Unusual fatigue
• Pelvic pressure that doesn't resolve
• Round ligament pain that persists
• Braxton Hicks that continue
• Just not feeling it

Your body is doing something remarkable. Respect its signals.

Gear and Modifications

Essential Gear

Supportive sports bra:

Breasts grow significantly. Invest in high-support, adjustable bras. You may go up multiple sizes.

Belly support band:

Options include:

• Simple stretchy bands
• Full maternity shorts with built-in support
• Dedicated support garments

Try a few to find what works.

Shoes:

Feet often grow during pregnancy (arches flatten, swelling). You may need a half size up or new shoes.

Hydration

You need more water.

• Carry water on all runs
• Drink before you're thirsty
• Electrolytes help in hot weather
• Dehydration can trigger contractions

Nutrition

Running while pregnant burns extra calories.

• Eat enough—this isn't the time for restriction
• Carbs before runs prevent bonking
• Protein for recovery
• Listen to hunger signals

Heat Management

You overheat more easily.

• Avoid running in hot conditions
• Choose early morning or evening
• Dress in light, breathable layers
• Skip if temperature is extreme

Core temperature above 102°F may pose risks to baby. Don't let yourself overheat.

Mental Approach

Letting Go of Expectations

Pregnancy running is different running.

• You're not training for a PR
• Pace will slow
• Mileage will drop
• Some days won't work

This is temporary. You'll return to normal training postpartum.

What Success Looks Like

Successful pregnant running means:

• Staying healthy
• Feeling good (most days)
• Maintaining some fitness
• Enjoying movement when possible

It doesn't mean:

• Matching pre-pregnancy paces
• Hitting mileage goals
• Racing competitively
• Never missing a run

Building Support

Tell your healthcare provider you want to keep running. Good providers support active pregnant women.

Connect with other pregnant runners. Online communities exist. You're not alone.

Communicate with running partners. They can adapt if you want company.

Running during pregnancy is safe, beneficial, and possible for most women—but it requires adaptation and flexibility. Listen to your body, work with your provider, and let go of pace expectations. The miles you run now aren't about performance; they're about staying healthy and connected to something you love. Your running self will still be there on the other side.

Track your pregnancy running on your dashboard.