Gym training during pregnancy: a safe guide for expectant mothers

Can you train at the gym while pregnant? Yes, and in an uncomplicated pregnancy, a pregnancy workout can be both safe and beneficial. Recommendations from the American College of Obstetricians and Gynecologists (ACOG) and Finnish guidance on exercise in pregnancy both support moderate-intensity exercise during pregnancy, and exercise does not increase the risk of miscarriage, preterm birth, or low birth weight (ACOG 2020; UKK Institute 2021).

Moderate-intensity pregnancy exercise is therefore considered safe throughout pregnancy. It's still worth checking that there are no contraindications and that your doctor, maternity clinic, or other healthcare provider has given you the go-ahead to exercise.

This article covers what to keep in mind when training at the gym during the different stages of pregnancy, which exercises are suitable for expectant mothers, and when training should be scaled back or avoided. It's intended for expectant mothers who want to continue strength training — or start exercising during pregnancy — and is just as useful for experienced gym-goers as it is for someone planning their very first session and looking for a practical exercise program.

Why is exercise beneficial during pregnancy?

The research evidence on the benefits of exercise during pregnancy is strong and consistent. Regular exercise reduces the risk of gestational diabetes, helps support healthy weight gain, relieves back problems, and improves mood. Good muscular fitness may also make giving birth easier and support recovery afterwards (ACOG 2020; DiPietro et al. 2019). Exercise — and strength training in particular — therefore offers benefits during pregnancy that go well beyond simply maintaining fitness and can help you maintain strength while staying active.

Returning to regular training after pregnancy is also much easier when you've maintained as much of your fitness as possible throughout pregnancy. Pregnancy lasts nine months, after all, which is a long time to stop training entirely.

More specifically, exercise can benefit several areas at once.

• Exercise during pregnancy helps manage weight gain. Regular physical activity can support healthy weight gain during pregnancy, including in pregnant women whose starting weight is higher than average.

• Exercise during pregnancy improves glucose metabolism. The effect is most clearly seen in the prevention and management of gestational diabetes.

• Exercise during pregnancy improves the mother's mood and well-being. Exercise reduces the occurrence of depressive symptoms during pregnancy by up to 67%.

• Exercise during pregnancy improves the mother's mood and sleep quality. Better sleep supports recovery and coping with everyday life.

• Exercise during pregnancy improves the mother's physical fitness. Good fitness makes everyday tasks easier, from climbing stairs and carrying grocery bags to carrying the baby later on.

• The mother's exercise improves the baby's oxygen and glucose supply. Reviews have also found indications of a reduced risk of fetal overgrowth (macrosomia).

• Exercise during pregnancy speeds up the return to your previous weight after birth. Even so, it's worth taking your return to training slowly.

Gym training has one particular advantage during pregnancy: the load is easy to adjust. Weights, sets, and exercises can be modified to match how you feel, making strength training a manageable way to stay active even as your body changes from week to week. Strength training supports the back, pelvis, and core control, while strong legs help carry the increasing load as pregnancy progresses.

Gym training is therefore a good option during pregnancy, provided there are no contraindications. Pregnancy does, however, bring certain training priorities into focus. Strengthening the pelvic floor muscles is particularly important, because the pelvic floor supports an increasing load for months. It's worth starting pelvic floor training as early as the first trimester, when you can learn the technique without rushing.

The gym isn't the only option. Walking and swimming are also suitable forms of aerobic exercise during pregnancy. Walking complements gym training well on lighter days, while swimming allows the water to support part of your body weight, which can feel more comfortable later in pregnancy. Ideally, your routine includes a varied mix of strength training, aerobic exercise, and other forms of physical activity.

When is exercise not safe during pregnancy?

Certain pregnancy complications make exercise during pregnancy unsuitable or require careful assessment with your healthcare provider. Absolute contraindications include, among others, placenta previa in late pregnancy, threatened preterm birth, cervical problems such as cervical insufficiency, pre-eclampsia, and certain heart and lung conditions. In these situations, the decision about exercise should always be made with a doctor.

Severe anemia, poorly controlled diabetes, and unexplained bleeding are also situations in which exercise should be discussed separately with your healthcare provider. Stop exercising immediately and contact your maternity clinic or doctor if you experience any of the following:

• vaginal bleeding

• contractions or strong lower abdominal pain

• severe dizziness or feeling faint

• shortness of breath at rest or during light exertion

• chest pain or abnormal heart palpitations

• headache or visual disturbances

• rupture of the membranes (waters breaking)

These situations are relatively rare, but it's still useful to know the warning signs in case symptoms occur.

More commonly, training simply needs to be scaled back as pregnancy progresses, with some exercises modified along the way. Scaling back doesn't mean stopping altogether. Often, lowering the load slightly and switching to more suitable exercise variations is enough to keep training safely. If a particular symptom keeps recurring during the same exercises, write down when it appears and how long it lasts. That information can help your maternity clinic or physiotherapist assess what needs to change in your program and what can stay the same.

With multiple pregnancies and other high-risk pregnancies, exercise should always be discussed separately with your doctor. Even if you were physically fit and trained extensively prior to pregnancy, medical guidance is needed if the pregnancy is atypical.

Pregnancy also raises resting heart rate and the heart's stroke volume. A familiar workout may therefore feel noticeably harder than it did before pregnancy, even if the loads stay exactly the same. This is a normal physiological change. A greater sense of exertion is therefore not, by itself, a sign that something is wrong.

Training during the different stages of pregnancy

Pregnancy isn't one stable phase; the body changes significantly over the nine months. Your pregnancy workout should adapt as pregnancy progresses, and the exercise program should evolve along with it.

First trimester (weeks 1–12)

In the first trimester, you can usually continue training much as before if you feel well enough. There's no need to change exercises or weights simply because you're pregnant. The biggest challenge is often nausea and fatigue, which can make training unappealing altogether. That's completely normal, and there's no reason to worry about missed workouts. Individualized coaching can also help here by making sure your training remains appropriate and recovery is taken into account.

A varied diet is also worth prioritizing to support recovery and the pregnancy itself.

Second trimester (weeks 13–27)

For many expectant mothers, the second trimester is the most comfortable period for training. Nausea has usually eased, and many have more energy again. The growing belly does, however, start to affect balance and exercise technique, so ranges of motion may need to be adjusted.

The most significant change concerns exercises performed lying on your back. The growing uterus can press on the large vena cava when you're lying supine. For this reason, from around week 16 onward, it's worth avoiding long periods on your back if the position makes you feel dizzy or faint (Mottola et al. 2019).

In practice, this may mean swapping the bench press for an incline press or seated chest press. Exercises that load the rectus abdominis, such as crunches, should also be dropped once abdominal separation (diastasis recti) starts to develop.

Third trimester (weeks 28–40)

In the third trimester and later pregnancy, the goal of training changes. Rather than chasing progress, the focus shifts to maintaining fitness and feeling good. Pregnancy moves the body's center of gravity forward, so it can make sense to replace free-weight exercises that demand a lot of balance with machine-based alternatives, or to choose free-weight exercises that still feel safe to perform. If you feel that your technique could break down on a particular exercise at this stage, it's best to swap it for an easier alternative, such as a machine-based exercise.

Gym machines provide more support and reduce the risk of losing balance. For many, they're therefore a natural choice in the final months. It's also easier to stop a set midway on a machine if you suddenly feel unwell.

The hormone relaxin, secreted by the placenta, loosens ligaments and joints. This can affect joint control and cause pain in the pelvic area. Jumping and contact sports are among the activities to avoid during pregnancy, and for the same reason rapid changes of direction are best left out in late pregnancy.

Pelvic floor exercises are especially valuable at this stage, as they strengthen the pelvic floor muscles and support both late pregnancy and recovery after birth. A useful rule of thumb throughout pregnancy is to listen to your body. If an exercise feels uncomfortable, you don't have to do it — there's always an alternative.

Which exercises are suitable for gym training during pregnancy?

Most basic gym exercises are suitable for expectant mothers. Strength training can be continued during pregnancy as long as you listen to your body and keep the loads moderate. Suitable upper body and lower body options throughout pregnancy include, for example, the following exercises:

• Leg press on a machine

• Lat pulldown and seated cable row

• Chest press on a machine, seated or at a light incline

• Lateral raises and other dumbbell exercises with light weights

• Seated leg extension and leg curl

• Exercises requiring pelvic floor and core stability

Technique matters more during pregnancy than the amount of weight, so focus on controlled, high-quality repetitions and let the muscles do the work. It's especially sensible to prioritize exercises you're already familiar with, so the technique feels secure.

Exercises that require extra caution or modification include heavy deadlifts and squats, exercises performed lying on your back for long periods, and movements that require forceful breath-holding under a heavy load. This kind of straining while holding your breath (the so-called Valsalva maneuver) temporarily raises blood pressure and intra-abdominal pressure.

Especially later in pregnancy, it makes sense to avoid exercises that substantially increase intra-abdominal pressure, such as the heavy deadlifts and squats mentioned above, particularly when the effort becomes very strenuous. Safe technique in these movements often involves strong bracing and breath-holding during the repetition, and prolonged breath-holding is worth avoiding in late pregnancy — which is why these exercises may no longer be the best choice.

The aim isn't to scare you into giving up exercise. Safe training during pregnancy means choosing suitable movements and managing the load sensibly — not stopping altogether.

Regular exercise throughout pregnancy: how often and how hard?

The recommendations of the UKK Institute and ACOG are broadly in line with each other. Pregnant women are advised to aim for 150 minutes of moderate-intensity physical activity per week during pregnancy, spread across at least three days. This gives a useful weekly target for moderate activity.

Strength training is recommended at least twice a week, including during weeks when other exercise remains light.

In practice, this can mean two or three moderate-intensity gym sessions per week, with the remaining activity coming from walking, swimming, and everyday movement. Because the recommendation is 150 minutes of exercise per week, lighter activity outside the gym will usually make up part of the total.

On a scale of 1–10, a suitable intensity is around 5–7. Maximum-effort sets, very strenuous exercise, and personal-record attempts are best avoided during pregnancy, but training doesn't have to feel easy to be appropriate.

As pregnancy progresses, you'll usually need to reduce your working weights somewhat, and there's no reason to worry about it. You can build back toward your previous loads after pregnancy, and continuing to train during pregnancy can make that return easier. Slightly longer sets may also make sense, as they can make technique easier to control without driving intra-abdominal pressure as high. A typical rep range is around 8–15 reps, but that's a guideline rather than a ready-made prescription for everyone.

Sets, loads, and exercises should always be individualized. A science-based training app can help manage these variables, and you can also talk with your doctor, maternity clinic, or other healthcare provider, including a physiotherapist if you want more precise guidance on your own limitations. If you didn't train prior to pregnancy and want to start exercising now, start gently. One or two gym sessions per week is already a good starting point, even for someone beginning from scratch. For endurance exercise, 15 minutes at a time two or three times a week is a reasonable place to start, and you can gradually work toward 30 minutes as long as you continue to feel good.

Nutrition, recovery, and returning to the gym after birth

Energy needs increase during pregnancy, especially from the second trimester onward. Pregnancy is not the time to pursue weight loss or intentionally try to lose weight, and a calorie deficit should not be the goal at any stage of pregnancy. For an expectant mother who trains, adequate protein intake and good hydration are especially important, as blood volume increases considerably during pregnancy. For more specific nutrition questions, your maternity clinic or a licensed dietitian is the best source of individual guidance.

Recovery deserves just as much attention as training itself. Sleep, light walks, and calm breathing exercises can all support recovery on days when you don't have the energy for the gym. Mental well-being is part of recovery too, and exercise during pregnancy reduces the risk of depressive symptoms by up to 67%.

Regular exercise often supports sleep, but training too late or too hard can make it more difficult for some people to fall asleep. It's therefore worth experimenting with workout timing to see what suits you best.

How soon you can return to the gym depends on the type of delivery and how recovery progresses. After a vaginal birth, light exercise is often possible within a few weeks, whereas recovery after a cesarean section typically takes six to eight weeks. Light pelvic floor exercises can be started early, with a gradual return to strength training afterwards. The final go-ahead should come from your doctor at the postpartum checkup.

How does AITOFIT support training during pregnancy?

The AITOFIT app, built by exercise scientists, individualizes training and helps keep the training load appropriate. It can provide a structured prenatal workout plan while still adapting the exercise program to you. Each exercise has a wide range of alternatives, making it easy to swap movements based on what suits you best. The app automatically adjusts variables such as volume and working weights, which is especially useful during pregnancy when your energy levels and capacity can vary from week to week.

No app or coaching can replace the guidance of a doctor, maternity clinic, or other healthcare provider during pregnancy. AITOFIT can, however, help keep prenatal workouts structured so that every workout has a clear plan and the load stays under control. You can try the app free for 9 days, giving you time to see how AITOFIT works for you. The app also includes a chat where professionals can answer questions, including those related to pregnancy.

Frequently asked questions

Can you lift weights while pregnant?

Yes, with moderate loads. Avoid maximal efforts and pay attention to how your body feels.

When do you have to stop gym training?

There's no universal week when everyone needs to stop, and many people train into the final weeks. Stop training if your doctor advises you to do so or if warning symptoms appear, such as bleeding, contractions, or severe dizziness.

Can you start gym training only during pregnancy?

Yes. People who were previously inactive can also start exercising and do moderate exercise during pregnancy (ACOG 2020). Start gently and increase the load gradually. At this stage, individualized guidance can help ensure that training suits your situation.

Is training the abdominal muscles safe while pregnant?

Training the pelvic floor and abdominal muscles is recommended throughout pregnancy. Exercises that load the rectus abdominis, such as crunches, should be dropped once separation (diastasis recti) starts to develop, typically toward the end of the second trimester.

How soon after birth can you return to the gym?

It depends on the type of delivery and how recovery progresses. After a vaginal birth, light exercise may be possible within a few weeks; after a cesarean section, recovery typically takes 6–8 weeks. Discuss your return to training with your doctor or maternity clinic.

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Sources: ACOG (2020). Physical Activity and Exercise During Pregnancy and the Postpartum Period. ACOG Committee Opinion No. 804. Obstetrics & Gynecology 135:e178–188. UKK Institute (2021). Physical activity recommendation for pregnant women. DiPietro L, Evenson KR, Bloodgood B et al. (2019). Benefits of physical activity during pregnancy and postpartum: An umbrella review. Medicine & Science in Sports & Exercise 51:1292–1302. Mottola MF, Nagpal TS, Bgeginski R et al. (2019). Is supine exercise associated with adverse maternal and fetal outcomes? A systematic review. British Journal of Sports Medicine 53:82–89.

Author: Tapio Tulenheimo, M.Sc. in Exercise Science (Exercise Physiology), University of Jyväskylä | Reviewed by: Julius Granlund, M.Sc. in Exercise Science (Exercise Physiology), University of Jyväskylä