Can I start exercising during pregnancy if I was not active before?

Yes. Pregnancy is a safe time to start a gentle exercise routine. Begin with walking — even 10-minute walks count. Gradually increase duration and intensity as your fitness improves. Swimming, prenatal yoga, and stationary cycling are excellent starter activities. Start slowly and listen to your body.

Is running safe during pregnancy?

If you were a runner before pregnancy, you can generally continue running with modifications — shorter distances, slower pace, and good hydration. As your belly grows, the impact and balance changes may make running uncomfortable, and many runners transition to walking or swimming in the third trimester. If you were not a runner before pregnancy, now is not the time to start.

Can I do ab exercises while pregnant?

Modified core work is safe and beneficial — it supports your back and prepares you for labor. Avoid traditional crunches and sit-ups after the first trimester (they can worsen diastasis recti). Instead, do planks (modified on knees if needed), bird-dogs, pelvic tilts, and standing core work. Stop any exercise that causes doming or coning along your midline.

How do I know if I am overdoing it?

Use the talk test: you should be able to carry on a conversation while exercising. If you are too breathless to talk, slow down. Stop immediately if you experience vaginal bleeding, fluid leakage, dizziness, chest pain, headache, calf swelling, or regular painful contractions. Pregnancy is not the time to push for personal records.

GUIDE

Exercise During Pregnancy Safety

Published on March 30, 2026·Updated on April 8, 2026

Exercise is safe and recommended during pregnancy. ACOG advises 150 minutes of moderate activity per week for uncomplicated pregnancies.

The benefits are substantial: reduced risk of gestational diabetes, preeclampsia, and cesarean delivery, plus better mood, sleep, and postpartum recovery. The key is knowing which activities are safe, which to avoid, and when to stop.

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Why Exercise Matters During Pregnancy

Exercise during pregnancy is not just safe — it is one of the best things you can do for yourself and your baby. ACOG recommends at least 150 minutes of moderate-intensity aerobic activity per week for people with uncomplicated pregnancies.

The evidence is strong. Regular exercise reduces the risk of gestational diabetes by up to 50 percent, lowers preeclampsia risk, decreases the likelihood of cesarean delivery, shortens labor duration, improves mood and reduces anxiety, helps manage back pain, and improves sleep quality. For a detailed, trimester-by-trimester workout plan, see our comprehensive pregnancy exercise guide.

Safe Activities

Walking — the most accessible exercise, safe throughout all trimesters, no equipment needed
Swimming and water aerobics — low-impact, supports your weight, helps with swelling, keeps you cool
Prenatal yoga — improves flexibility, strength, balance, and breathing for labor
Stationary cycling — cardiovascular exercise without balance risk
Low-impact aerobics — prenatal fitness classes designed for pregnancy
Elliptical machine — gentle on joints, easy to control intensity
Modified strength training — lighter weights, higher reps, avoid lying flat after the first trimester
Pelvic floor exercises (Kegels) — essential for labor preparation and postpartum recovery

Choose activities you enjoy. Consistency matters more than intensity. Even short walks throughout the day count toward your weekly goal.

Activities to Avoid

Contact sports — soccer, basketball, hockey, boxing, martial arts, or anything with collision risk
Activities with fall risk — downhill skiing, horseback riding, mountain biking, gymnastics, surfing
Scuba diving — pressure changes can cause decompression sickness in the fetus
Hot yoga or hot Pilates — exercising in heated rooms risks dangerous overheating
Exercises lying flat on your back after the first trimester — uterus weight compresses the vena cava
High-altitude training above 6,000 feet if not already acclimatized — reduced oxygen availability
Heavy lifting to maximal effort — avoid the Valsalva maneuver (bearing down while holding your breath)
Skydiving, bungee jumping, or any activity with sudden pressure changes

The common thread: avoid collision risk, fall risk, excessive heat, and pressure changes.

The talk test is your best guide

Forget heart rate monitors and complicated formulas. The simplest way to gauge exercise intensity during pregnancy is the talk test: if you can carry on a conversation while exercising, your intensity is appropriate. If you are too breathless to talk, slow down. If you can sing, you could push a little harder.

Warning Signs — Stop and Call Your Provider

Vaginal bleeding or fluid leakage
Regular painful contractions (not Braxton Hicks)
Dizziness or feeling faint
Shortness of breath before starting exercise
Chest pain or heart palpitations
Headache that does not resolve with rest
Calf pain or swelling (possible blood clot)
Muscle weakness affecting balance

These symptoms are rare but warrant immediate attention. Most people exercise safely throughout pregnancy without issues.

Modifications by Trimester

In the first trimester, continue your pre-pregnancy routine with minor modifications. Nausea and fatigue may limit you — do what you can. If you are new to exercise, start with walking and swimming.

In the second trimester, avoid exercises lying flat on your back. Shift to side-lying, incline, or seated alternatives. This is often the most comfortable trimester for exercise as nausea fades and energy returns.

In the third trimester, reduce intensity as needed. Focus on walking, swimming, prenatal yoga, pelvic floor exercises, and gentle stretching. Some days a walk is all you can manage, and that is perfectly fine.

Exercise and Common Pregnancy Concerns

Exercise helps with many pregnancy discomforts. It reduces constipation, eases swollen feet, and improves sleep quality. Swimming in particular is excellent for back pain because the water supports your weight and takes pressure off your spine.

Avoid exercising in hot environments — overheating during pregnancy carries risks, especially in the first trimester. For more on heat safety, see our hot tub during pregnancy guide. For the complete picture of prenatal care, check our prenatal visit schedule.

Related Guides

Sources

American College of Obstetricians and Gynecologists (ACOG) — Environmental exposures during pregnancy
U.S. Food and Drug Administration (FDA) — Medicine and pregnancy
Centers for Disease Control and Prevention (CDC) — Pregnancy and health
Mayo Clinic — Pregnancy dos and don'ts

This guide is for informational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider with any questions about your pregnancy.

Frequently asked questions

Can I start exercising during pregnancy if I was not active before?: Yes. Pregnancy is a safe time to start a gentle exercise routine. Begin with walking — even 10-minute walks count. Gradually increase duration and intensity as your fitness improves. Swimming, prenatal yoga, and stationary cycling are excellent starter activities. Start slowly and listen to your body.
Is running safe during pregnancy?: If you were a runner before pregnancy, you can generally continue running with modifications — shorter distances, slower pace, and good hydration. As your belly grows, the impact and balance changes may make running uncomfortable, and many runners transition to walking or swimming in the third trimester. If you were not a runner before pregnancy, now is not the time to start.
Can I do ab exercises while pregnant?: Modified core work is safe and beneficial — it supports your back and prepares you for labor. Avoid traditional crunches and sit-ups after the first trimester (they can worsen diastasis recti). Instead, do planks (modified on knees if needed), bird-dogs, pelvic tilts, and standing core work. Stop any exercise that causes doming or coning along your midline.
How do I know if I am overdoing it?: Use the talk test: you should be able to carry on a conversation while exercising. If you are too breathless to talk, slow down. Stop immediately if you experience vaginal bleeding, fluid leakage, dizziness, chest pain, headache, calf swelling, or regular painful contractions. Pregnancy is not the time to push for personal records.

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