Physical activity during pregnancy has come a long way from the days when pregnant women were advised to rest and avoid exertion. Current evidence strongly supports moderate exercise as beneficial for most pregnant women—and this holds true for women over 35. Yet questions about what is safe, what is beneficial, and what changes as pregnancy progresses remain common, particularly for active women who want to maintain their fitness routines.
This article draws on current research and guidelines to offer an evidence-informed overview of exercise during pregnancy after 35. As with all health decisions during pregnancy, the guidance here is intended to inform conversations with your healthcare provider, who can advise based on your individual pregnancy and health history.
What Research Shows About Exercise and Pregnancy Outcomes
The evidence base for exercise during pregnancy has grown substantially over the past two decades. According to guidelines from the American College of Obstetricians and Gynecologists, regular moderate-intensity aerobic exercise during pregnancy is associated with multiple benefits for both maternal and fetal health. These include:
- Reduced risk of gestational diabetes and gestational hypertension
- Lower rates of excessive gestational weight gain
- Improved maternal mood and reduced prenatal anxiety and depression
- Better sleep quality during pregnancy
- Potentially shorter active labor and reduced rate of cesarean delivery in some studies
- Faster postpartum recovery in some research
Current guidelines recommend that healthy pregnant women engage in at least 150 minutes per week of moderate-intensity aerobic activity, spread across several days—the same level recommended for the general adult population. These guidelines apply to women over 35 with uncomplicated pregnancies, though individual medical factors always warrant a personalized discussion.
Safe and Beneficial Exercise Types During Pregnancy
Most forms of exercise that were comfortable before pregnancy can be continued during pregnancy with appropriate modifications as the pregnancy progresses. Research supports a range of modalities:
Aerobic Exercise
Walking remains one of the most universally accessible and evidence-supported forms of pregnancy exercise. Cycling on a stationary bike (which reduces fall risk), swimming, and low-impact aerobics are also commonly recommended. Research indicates that cardiovascular exercise at moderate intensity—where you can hold a conversation but are breathing more than at rest—is the target level for most pregnant women.
Strength Training
Moderate strength training is supported as beneficial during pregnancy, with some modifications. Using machines or lighter free weights with controlled movements is generally preferable to maximal lifting. As pregnancy progresses, avoiding exercises that require lying flat on the back for extended periods is typically recommended from the second trimester onward due to the potential for the uterus to compress the vena cava, affecting blood return to the heart.
Prenatal Yoga and Pilates
Both prenatal yoga and Pilates have evidence of benefit during pregnancy, particularly for flexibility, pelvic floor awareness, stress reduction, and core strength. Instructors certified in prenatal modifications can tailor practices to different trimesters. Hot yoga and Bikram yoga are generally not recommended during pregnancy due to concerns about elevated core temperature.
Water-Based Exercise
Aquatic exercise, including swimming and water aerobics, is particularly beneficial during pregnancy because it reduces musculoskeletal strain, supports body weight (offering relief from common discomforts), and maintains cardiovascular fitness with low injury risk. Many women who find other exercises uncomfortable as the uterus grows continue to swim or exercise in water with comfort throughout pregnancy.
Connecting this to evidence-based pregnancy wellness approaches for women over 35 may offer further context for those building their prenatal activity routine.
Modifications Across the Trimesters
Exercise during pregnancy naturally evolves as the pregnancy progresses and the body changes:
- First trimester: Exercise is generally safe as before pregnancy, though fatigue and nausea may limit tolerance. Listening to the body and reducing intensity on difficult days is appropriate. Maintaining hydration and avoiding overheating are important.
- Second trimester: As the abdomen grows, balance changes and modifications may become necessary. Contact sports and activities with high fall risk are typically recommended against. Supine (lying flat) exercise for extended periods is generally modified from this stage.
- Third trimester: Further modifications may be needed as the center of gravity shifts significantly. Lower-impact activities, focus on pelvic floor health, and exercises supporting functional movement for labor preparation are often emphasized.
When to Pause or Modify Exercise
ACOG guidelines identify several warning signs that should prompt pausing exercise and contacting a healthcare provider. These include:
- Vaginal bleeding or fluid leaking from the vagina
- Shortness of breath before exertion
- Chest pain or palpitations
- Dizziness or feeling faint
- Decreased fetal movement
- Uterine contractions, calf pain, or swelling
- Headache that is unusual or severe
Understanding when to seek guidance is as important as understanding what exercise is supported. Prenatal healthcare guidance for women over 35 provides additional context for navigating the medical dimensions of later pregnancy.
Contraindications: When Exercise May Not Be Recommended
Certain medical conditions and pregnancy complications may mean that exercise needs to be modified or avoided. These include (but are not limited to) placenta previa, preeclampsia, preterm labor risk, significant heart or lung conditions, certain types of anemia, or specific fetal growth concerns. Your OB/GYN or midwife is the appropriate guide for understanding which activities are appropriate in the context of your individual pregnancy.
Frequently Asked Questions
Can I continue running during pregnancy after 35?
Many women continue running into the second trimester and sometimes beyond with appropriate modifications, particularly if they were regular runners before pregnancy. As pregnancy progresses, pelvic floor demands increase, and some women find running uncomfortable or need to modify their gait. Using a supportive maternity belt, reducing pace and distance as needed, and stopping if any warning symptoms arise are reasonable approaches. Discussing your running practice with your OB/GYN and, if available, a pelvic floor physiotherapist is advisable.
Is it safe to do high-intensity interval training (HIIT) during pregnancy?
Women who regularly engaged in high-intensity exercise before pregnancy may be able to continue at a modified intensity during pregnancy, particularly in the first and early second trimester. As pregnancy progresses, the ability to regulate core temperature, oxygen demand, and physical impact all become more relevant. Most guidelines suggest transitioning toward moderate intensity rather than maximum exertion during pregnancy. Individual guidance from your healthcare provider, based on your fitness history and pregnancy status, is the most reliable approach.
How does exercise affect sleep during pregnancy?
Research suggests that moderate aerobic exercise during pregnancy is associated with improved sleep quality, potentially including reduced insomnia and sleep disruption. Timing matters—exercise completed earlier in the day or late afternoon may be better tolerated than vigorous exercise close to bedtime, though individual responses vary. Gentle movement such as stretching or prenatal yoga in the evening is generally well-tolerated and may support relaxation.
What about pelvic floor exercises during pregnancy?
Pelvic floor muscle training (including Kegel exercises) during pregnancy has evidence of benefit for urinary continence and pelvic floor strength both during and after pregnancy. However, effective pelvic floor training involves more than simple Kegel repetitions—it includes both strengthening and the ability to release and relax the pelvic floor. Working with a pelvic floor physiotherapist during pregnancy can provide personalized guidance that simple instruction sheets cannot replicate.
Key Takeaways
- Current evidence strongly supports moderate exercise during pregnancy, with ACOG recommending approximately 150 minutes of moderate aerobic activity per week for healthy pregnant women.
- Benefits include reduced risk of gestational diabetes, improved mood, better sleep quality, and potentially smoother postpartum recovery.
- Most forms of exercise tolerated before pregnancy can continue with appropriate trimester-based modifications; high-risk or contact activities are generally modified or avoided.
- Warning symptoms including vaginal bleeding, chest pain, dizziness, or significant shortness of breath should prompt stopping exercise and contacting a healthcare provider.
- Individual guidance from your OB/GYN or midwife—based on your specific pregnancy and health history—is the most reliable foundation for pregnancy exercise decisions.
Medical Disclaimer
This content is for informational purposes only and does not constitute medical advice. Individual health situations vary significantly. Always consult a qualified healthcare provider before making decisions related to your health, fertility, or pregnancy.
About the Author
Emily Carter is a women’s health writer focused on fertility, pregnancy after 35, and sleep changes in midlife. She writes research-informed, non-alarmist content to help women navigate reproductive and hormonal transitions with clarity and confidence.