Exercise During Pregnancy: Safe Workouts for Each Trimester

Exercise during pregnancy isn't just safe—it's recommended. Regular physical activity benefits both you and your baby, from easier labor to faster postpartum recovery. But pregnancy changes your body in ways that require exercise adaptations. Here's your trimester-by-trimester guide to staying fit while growing a human.

Benefits of Exercise During Pregnancy

For You:

• Reduces back pain
• Decreases constipation and bloating
• May prevent gestational diabetes
• Improves mood and energy
• Promotes better sleep
• Builds stamina for labor
• Faster postpartum recovery
• Helps manage healthy weight gain

For Baby:

• Healthy birth weight
• Possibly better stress tolerance
• May support brain development

The Evidence: Major medical organizations recommend 150 minutes of moderate exercise per week during uncomplicated pregnancies.

Getting Cleared

Talk to Your Provider: Before starting or continuing exercise during pregnancy, discuss with your OB or midwife—especially if you have:

• Heart or lung disease
• Cervical insufficiency
• Multiple gestation at risk for preterm labor
• Placenta previa after 26 weeks
• Preterm labor or ruptured membranes
• Preeclampsia or pregnancy-induced hypertension
• Severe anemia

For Most Healthy Pregnancies: Exercise is encouraged and safe throughout.

First Trimester (Weeks 1-13)

What's Happening:

• Fatigue and nausea are common
• Physically, your body looks similar
• Hormonal changes begin affecting joints

Exercise Approach:

• Continue your pre-pregnancy routine if you had one
• If new to exercise, start gently
• Listen to fatigue—rest when needed
• Stay hydrated (crucial for nausea too)

Good Activities:

• Walking
• Swimming
• Stationary cycling
• Light strength training
• Prenatal yoga

Modifications:

• Skip exercise when severely nauseated
• Reduce intensity if fatigue is overwhelming
• Start prenatal vitamins (supports exercise tolerance)

Second Trimester (Weeks 14-27)

What's Happening:

• Often the "golden trimester"—energy returns
• Belly grows, center of gravity shifts
• Relaxin loosens joints
• May feel better than first trimester

Exercise Approach:

• Many women feel best for exercise now
• Adapt as belly grows
• Watch balance as center of gravity changes
• Avoid lying flat on back after ~20 weeks

Good Activities:

• Walking, swimming, cycling
• Prenatal strength training
• Prenatal yoga and Pilates
• Low-impact aerobics
• Elliptical trainer

Key Modifications:

No Lying Flat on Back: After about 20 weeks, avoid exercises lying flat on your back—the uterus can compress major blood vessels. Use incline positions or side-lying instead.

Balance Awareness: Your center of gravity is shifting. Be cautious with activities requiring balance. Use support when needed.

Joint Care: Relaxin makes joints looser. Avoid extreme ranges of motion and heavy lifting.

Third Trimester (Weeks 28-40)

What's Happening:

• Belly is large, affecting movement
• Shortness of breath may increase
• Fatigue often returns
• Joints are at their loosest
• Preparing for labor

Exercise Approach:

• Intensity naturally decreases
• Focus on maintaining, not gaining
• Walking and swimming often most comfortable
• Prepare body for labor
• Listen to your body closely

Good Activities:

• Walking
• Swimming (often feels amazing)
• Prenatal yoga
• Gentle strength training
• Pelvic floor exercises
• Birth preparation movements (squatting, pelvic tilts)

Key Modifications:

• Further reduce intensity as needed
• Shorter sessions may work better
• More rest between exercises
• Avoid exercises with fall risk
• No jumping or jarring movements
• Stop if uncomfortable

Exercises to Avoid During Pregnancy

Throughout Pregnancy:

• Contact sports (soccer, basketball, hockey)
• Activities with fall risk (skiing, horseback riding, gymnastics)
• Scuba diving
• Hot yoga or hot Pilates
• Activities at high altitude (if not acclimated)
• Lying flat on back after 20 weeks

As Pregnancy Progresses:

• High-impact jumping
• Exercises with risk of abdominal trauma
• Heavy lifting with straining
• Exercises requiring lying face-down
• Extreme balance challenges

Safe Exercises Throughout Pregnancy

Walking

The perfect pregnancy exercise:

• Safe throughout
• Easily adjusted intensity
• No equipment needed
• Maintains cardiovascular fitness

Swimming

Often the most comfortable:

• Water supports your weight
• Relieves joint pressure
• Full-body workout
• Stays comfortable in third trimester
• Reduces swelling

Stationary Cycling

Safe cardio option:

• Supports your weight
• No balance concerns
• Controlled environment
• Recumbent bikes offer back support

Prenatal Yoga

Excellent throughout:

• Prepares body for labor
• Reduces stress
• Improves flexibility
• Addresses common discomforts
• Many modifications available
• Builds community with other pregnant women

Strength Training (Modified)

Important for pregnancy and postpartum:

• Lighter weights, higher reps
• Avoid lying flat on back
• Skip exercises with fall risk
• Maintain muscle for labor and recovery
• Focus on posture muscles

Pelvic Floor Exercises (Kegels)

Essential:

• Squeeze pelvic floor muscles
• Hold 5-10 seconds
• Relax fully
• 10-15 reps, 3 sets daily
• Supports bladder and prepares for delivery

Warning Signs: When to Stop

Stop Exercising and Call Your Provider If:

• Vaginal bleeding
• Fluid leaking from vagina
• Dizziness or feeling faint
• Shortness of breath before starting exercise
• Chest pain
• Headache
• Muscle weakness
• Calf pain or swelling
• Regular, painful contractions
• Decreased fetal movement

Sample Workout Plans

First Trimester (If Energy Allows):

• 30 min cardio (walking, cycling) 4-5x/week
• Strength training 2x/week
• Yoga or stretching 1-2x/week

Second Trimester:

• 30 min moderate cardio 4-5x/week
• Prenatal strength training 2x/week
• Prenatal yoga 1-2x/week
• Daily pelvic floor exercises

Third Trimester:

• 20-30 min walking or swimming 4-5x/week
• Gentle strength maintenance 1-2x/week
• Prenatal yoga 1-2x/week
• Daily pelvic floor exercises
• Birth preparation stretches

Strength Training Modifications

Upper Body:

• Mostly unchanged early on
• Avoid lying flat for chest exercises—use incline
• Seated exercises work well

Lower Body:

• Squats are great for birth preparation
• Use support for balance
• Reduce depth as belly grows
• Wall squats and supported squats work well

Core:

• Avoid traditional crunches and sit-ups
• Focus on transverse abdominis activation
• Modified planks (incline or on knees)
• Bird dogs
• Pelvic tilts

Exercise and Common Pregnancy Discomforts

Back Pain:

• Strengthening helps
• Swimming often relieves
• Prenatal yoga addresses
• Avoid exercises that worsen it

Pelvic Girdle Pain:

• May need to limit certain exercises
• Avoid single-leg activities if painful
• Swimming often comfortable
• See pelvic floor PT if severe

Swelling:

• Swimming helps
• Walking promotes circulation
• Elevate legs after exercise

Heartburn:

• Avoid eating close to exercise
• Stay upright during and after
• Skip exercises that worsen it

Hydration and Nutrition

Stay Hydrated:

• Drink before, during, and after exercise
• Your blood volume increases during pregnancy
• Dehydration can trigger contractions

Fuel Appropriately:

• Don't exercise fasted if it makes you feel bad
• Small snack before if needed
• Eat enough to support exercise and pregnancy

Avoid Overheating:

• Exercise in climate-controlled environments
• Avoid hot yoga or exercising in heat
• Stay hydrated
• Don't push to point of overheating

Postpartum Preview

After delivery:

• Wait for provider clearance (usually 6 weeks, longer for C-section)
• Return gradually
• Address diastasis recti and pelvic floor
• Build back slowly—your body did a lot

The Bottom Line

Exercise during pregnancy is one of the best things you can do for yourself and your baby. It reduces discomforts, prepares you for labor, and sets you up for faster recovery.

Listen to your body. Modify as your pregnancy progresses. Stay hydrated. Stop if something doesn't feel right.

Your body is doing something extraordinary. Support it with movement, and it will carry you—and your baby—through pregnancy stronger and healthier.