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Physical activity during pregnancy is an area where research guidance has become increasingly clear and consistently positive over recent decades. For women pregnant after 35, exercise during pregnancy raises additional questions — about safety given age-related considerations, about how to modify familiar routines, and about what level of activity is actually supported by evidence for this population.
The good news is that current research and guidelines from major health organizations broadly support regular physical activity during uncomplicated pregnancies at any maternal age. As with most aspects of pregnancy after 35, individual circumstances matter, and what is appropriate for one woman may differ from another — which is why this article is best read as an introduction to the topic rather than a prescription.
What Current Guidelines Say About Exercise in Pregnancy
Guidelines from the American College of Obstetricians and Gynecologists (ACOG) and other major health organizations support regular moderate-intensity physical activity throughout uncomplicated pregnancies. ACOG recommends that pregnant women without medical contraindications aim for at least 150 minutes of moderate-intensity aerobic activity per week, spread across most days. This represents the same general recommendation as for the broader adult population.
The recognition that exercise during pregnancy is not only safe but actively beneficial represents a significant shift from older guidance, which was often more restrictive. Research now indicates that regular physical activity during pregnancy is associated with a range of favorable outcomes, including lower rates of gestational diabetes, better weight management, reduced risk of preeclampsia, improved mood, better sleep, and potentially shorter labor in some studies. These findings have contributed to the more affirmative stance of current guidelines.
Why Exercise May Be Particularly Valuable After 35
Several of the conditions that physical activity during pregnancy is associated with reducing — including gestational diabetes, preeclampsia, and excessive gestational weight gain — are conditions that also tend to increase in prevalence with maternal age. This suggests that maintaining appropriate physical activity during pregnancy after 35 may be of particular value, though this hypothesis is not yet well-supported by age-stratified intervention research specifically.
Research also suggests that exercise may support mood and reduce anxiety during pregnancy, which can be especially relevant for women who find that the psychological dimensions of pregnancy after 35 — including heightened health concerns and the weight of a wanted pregnancy — contribute to stress. For more on managing anxiety during pregnancy, our article on anxiety during pregnancy after 35 explores evidence-based coping strategies.
Types of Exercise Generally Considered Safe in Pregnancy
A variety of exercise modes are generally considered safe during uncomplicated pregnancy, with some modifications as the pregnancy progresses:
Aerobic Exercise
Walking, swimming, stationary cycling, low-impact aerobics, and prenatal yoga are among the most commonly recommended aerobic activities during pregnancy. These provide cardiovascular benefit with relatively low injury risk and can generally be maintained throughout most of the pregnancy with appropriate modifications. Swimming and water aerobics are particularly well-tolerated in the third trimester, as buoyancy reduces the strain of added weight. For home-based exercise sessions, a non-slip yoga mat provides a cushioned, stable surface for prenatal yoga and floor exercises as the pregnancy progresses.
Strength Training
Resistance training is generally considered safe during pregnancy when performed with appropriate modifications — including avoiding exercises that involve lying flat on the back after the first trimester (due to potential compression of the inferior vena cava) and avoiding Valsalva maneuvers (breath-holding under strain). Women who were engaged in strength training before pregnancy can often continue with modifications; those new to resistance training are generally advised to start gently and with guidance from a qualified fitness professional familiar with prenatal exercise.
Pelvic Floor Exercises
Pelvic floor exercises (Kegel exercises) are widely recommended during pregnancy to support pelvic floor health and reduce the risk of incontinence. However, the appropriate approach to pelvic floor exercise during pregnancy is more nuanced than often presented — some women enter pregnancy with hypertonic (overly tight) pelvic floors for whom standard Kegel exercises may not be the most appropriate approach. A pelvic floor physiotherapist can assess and provide individualized guidance. For more on pelvic floor health after delivery, our article on postpartum recovery after 35 discusses pelvic floor rehabilitation in the fourth trimester.
What to Modify as Pregnancy Progresses
Exercise during pregnancy generally requires increasing modifications as gestation advances and the body changes. Common adjustments include:
Avoiding exercises with high fall risk (skiing, equestrian sports, contact sports) throughout pregnancy. After the first trimester, avoiding supine (lying on back) exercises for extended periods. Reducing intensity as needed in response to fatigue, breathlessness, or other physical cues — the “talk test” (ability to hold a conversation during exercise) is a commonly recommended guide to appropriate intensity. Staying well hydrated and avoiding exercise in very hot or humid conditions, which can raise core temperature to levels of concern during pregnancy.
When to Check With a Healthcare Provider First
While exercise is broadly supported in uncomplicated pregnancy, there are medical conditions and pregnancy complications that may affect whether and how a woman should exercise. These include placenta previa, cervical incompetence, significant bleeding, preterm labor risk, severe anemia, and certain cardiac or pulmonary conditions. ACOG provides a list of absolute and relative contraindications to aerobic exercise in pregnancy. Before beginning or continuing a regular exercise program in pregnancy — particularly one that is vigorous or novel — discussing it with your obstetric provider is the appropriate first step.
Frequently Asked Questions
Is it safe to start exercising during pregnancy if I wasn’t active before?
Current guidance suggests that pregnancy can be an excellent time to begin building healthy exercise habits, starting gradually with low-impact activities like walking. Beginning exercise during pregnancy (rather than continuing a pre-existing routine) warrants a conversation with your healthcare provider first, particularly if you have any underlying health conditions. Starting slowly and building progressively is the general recommendation.
Can exercise cause miscarriage?
Research does not support the idea that moderate physical activity during uncomplicated pregnancy increases miscarriage risk. Most miscarriages in the first trimester are due to chromosomal factors unrelated to activity level. However, if you experience bleeding, cramping, or other concerning symptoms during or after exercise, contact your healthcare provider promptly.
What should I do if exercise is causing discomfort or symptoms?
ACOG recommends stopping exercise and contacting a healthcare provider if you experience chest pain, shortness of breath before exertion, dizziness, headache, calf pain or swelling, vaginal bleeding, preterm contractions, or decreased fetal movement during exercise. Adjusting exercise type and intensity based on how your body responds is always appropriate during pregnancy.
How does exercise affect sleep during pregnancy?
Research suggests that regular physical activity during pregnancy may support better sleep quality, including during the third trimester when sleep is often most disrupted. The timing of exercise may matter — vigorous exercise close to bedtime may interfere with sleep for some individuals, though this varies. For more on navigating sleep changes during pregnancy, our overview of sleep during pregnancy provides additional context.
Key Takeaways
- Current guidelines broadly support at least 150 minutes of moderate-intensity aerobic activity per week during uncomplicated pregnancy, at any maternal age.
- Exercise during pregnancy is associated with reduced risk of gestational diabetes, better mood and sleep, and potentially other favorable outcomes — benefits of particular relevance for women over 35.
- A range of exercise types are generally safe in pregnancy with appropriate modifications, including walking, swimming, prenatal yoga, and resistance training.
- Modifications become increasingly important as pregnancy progresses; a healthcare provider or prenatal fitness specialist can help adapt a program to your changing needs.
- Always discuss exercise plans with your obstetric care provider, particularly if you have medical conditions or pregnancy complications that may affect what is appropriate for you.
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, fitness, 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.