As pregnancy progresses, activities that once seemed simple can start to demand more from the body. The growing belly, changes in balance and the extra load on joints and muscles lead many pregnant women to look for comfortable ways to keep moving.
That's where water aerobics can become a great companion during pregnancy.
Exercises done in the water combine aerobic activity, mobility and strengthening with less impact on the joints. On top of that, the support the water provides can bring a pleasant feeling of lightness, especially as the belly grows.
For pregnant women without contraindications, staying physically active is recommended during pregnancy. The World Health Organization recommends at least 150 minutes a week of moderate-intensity aerobic physical activity, spread throughout the week.
But every pregnancy has its own particularities. So before starting a new activity, it's worth talking to the professional in charge of your prenatal care.
Why is water aerobics such a good match for pregnancy?
The main difference is the environment.
When we get into the pool, part of the body's weight is supported by the water. This reduces the impact of many movements and can make the exercises more comfortable.
Brazil's Ministry of Health itself includes water aerobics and swimming among the activities that can be done during pregnancy, noting that exercising in the water can ease the feeling of body weight and help reduce swelling.
At the same time, the water offers resistance to movement.
This means that seemingly simple exercises, like moving your arms or legs, can work different muscle groups without requiring heavy loads.
What are the benefits of physical activity during pregnancy?
Water aerobics is part of something bigger: keeping a physically active routine during a healthy pregnancy.
Regular physical activity during pregnancy can contribute to cardiovascular fitness, muscle strength, mobility and emotional well-being. The American College of Obstetricians and Gynecologists (ACOG) also points to benefits such as less back pain and a possible reduction in the risk of gestational diabetes, preeclampsia and cesarean delivery in certain contexts.
In the pool, there's an added advantage: moving can feel more comfortable as the weight of the belly increases.
For some pregnant women, this means being able to stay active even when walking or other exercises outside the water start to cause more discomfort.
Can it help with swelling?
During pregnancy, it's common to notice some degree of swelling, especially in the legs and feet.
The Caderneta Brasileira da Gestante (Brazil's official pregnancy booklet), published by Brazil's Ministry of Health, notes that activities done in the water, such as water aerobics and swimming, can help reduce swelling and ease the feeling of body weight.
That doesn't mean, however, that all swelling during pregnancy is normal.
If it appears suddenly or intensely, especially along with a severe headache, changes in vision, feeling unwell or other unusual symptoms, seek guidance from your prenatal care team.
What about back pain?
As the belly grows, the body's center of gravity shifts. The muscles need to adapt, and some pregnant women start to feel discomfort, mainly in the lower back.
Properly performed exercises can strengthen muscles that are important for supporting the body and help with mobility. Regular physical activity during pregnancy is also associated with less back pain.
Water aerobics can be especially comfortable because it lets you do many movements without putting the body's full weight on the joints.
But exercise shouldn't cause significant pain.
If a particular movement causes pain, stop it and adjust it with the professional's guidance.
Is water aerobics also strength training?
It can be.
The water's natural resistance makes the muscles work while the arms, legs and torso move.
Depending on the class, equipment designed for water activities may be used to increase or reduce resistance.
During pregnancy, though, the goal doesn't have to be “breaking records”.
The intensity should respect the pregnant woman's fitness level, the stage of pregnancy and the health team's recommendations.
How do I know if the intensity is right?
There's a very simple strategy: the talk test.
During moderate-intensity activity, you can usually hold a conversation while exercising.
If you're so out of breath that you can't finish a sentence, it's probably time to slow down.
This is one of the recommended ways to monitor exercise intensity during pregnancy.
Brazil's Ministry of Health also advises pregnant women to prioritize light- to moderate-intensity activities and to slow down if they can't talk while exercising.
In other words: you don't need to leave the pool completely wiped out for the class to have been worth it. 😅
Consistent, safe movement is worth much more than excessive intensity.
Do I need a class specifically for pregnant women?
Not necessarily, but it can be a great choice.
Classes for pregnant women usually adapt the exercises to the changes the body goes through during pregnancy.
If the class isn't specific, tell the instructor that you're pregnant and how far along you are.
Ideally, you should have a qualified professional who can adjust intensity, movements and exercises when needed.
As the weeks go by, what was comfortable early in pregnancy may need to be adapted.
I've never done water aerobics. Can I start during pregnancy?
In a pregnancy without contraindications, many women can start physical activity during pregnancy.
But those who were sedentary before pregnancy should start gradually.
The recommendation isn't to get off the couch and try to make up for everything in one week.
Starting with shorter sessions and gradually increasing duration and intensity is usually a more suitable strategy. ACOG advises gradual progression for pregnant women who weren't physically active before.
Talk about this during your prenatal care before you start.
What about women who already exercised before getting pregnant?
In many healthy pregnancies, women who were already physically active can keep exercising, making adjustments as needed.
Pregnancy doesn't automatically mean giving up every activity that was part of your routine.
The WHO recognizes that women who were already physically active, including with higher-intensity exercise, can stay active during pregnancy when there are no contraindications.
Even so, the intensity and type of activity may need to change over the months.
Don't forget water — even when you're in the water
Being immersed in the pool can give the impression that hydration isn't so important.
But the body keeps losing fluids during exercise.
So keep a water bottle nearby and drink water before, during and after the activity. This recommendation appears both in the Physical Activity Guide for the Brazilian Population (“Guia de Atividade Física para a População Brasileira”) and in ACOG's guidance.
Water should remain the main option for hydration.
Coconut water and other drinks can be part of your diet, but there's no need to use them in place of water during a regular water aerobics class.
And one important caution: don't use teas indiscriminately as a way to hydrate during pregnancy.
Some plants, herbs and substances found in teas may not be recommended during pregnancy. If you regularly drink a particular tea, it's worth talking to the professional who follows your prenatal care.
Be careful with heat, too
During pregnancy, it's important to avoid overheating while exercising.
Choose pools and spaces with a comfortable temperature and take breaks if you notice excessive heat, dizziness or feel unwell.
The recommendation to avoid overheating is especially important in early pregnancy.
Take care getting in and out of the pool
Water reduces the impact of exercise, but there's one small, not-so-fun detail: the floor around the pool is still slippery.
And during pregnancy, changes in your center of gravity can affect your balance.
So:
- walk slowly in wet areas;
- use the handrails when getting in and out of the pool;
- avoid sudden movements;
- wear non-slip footwear when appropriate;
- ask for help if you feel unsteady.
Sometimes the biggest risk in water aerobics isn't in the pool — it's in the three meters between the locker room and the pool.
Are there situations where exercise needs special evaluation?
Yes.
Although physical activity is safe for most healthy pregnant women, some conditions require individual monitoring and guidance.
The Physical Activity Guide for the Brazilian Population lists situations in which exercise needs to be carefully evaluated or may be contraindicated, including certain heart or respiratory diseases, bleeding during pregnancy, placental abruption, active preterm labor and severe cases of preeclampsia.
This reinforces why talking about exercise during prenatal care is important.
When should I stop exercising?
Even if you've been cleared to exercise, some signs should not be ignored.
Stop exercising and seek guidance from your health team if you have:
- vaginal bleeding;
- fluid leaking from the vagina;
- dizziness or feeling faint;
- shortness of breath even before starting to exercise;
- chest pain;
- a significant headache;
- regular, painful uterine contractions;
- muscle weakness that affects your balance;
- significant pain or swelling in the calf;
- significant abdominal pain.
These are among the warning signs described by ACOG for stopping exercise during pregnancy.
When in doubt, stop the activity.
A class can be picked up again later. Your safety comes first.
Can water aerobics prepare the body for childbirth?
It's better to think about it more broadly.
No single exercise can guarantee a particular type of birth.
But staying physically active during a healthy pregnancy can contribute to cardiovascular fitness, strength, mobility and functional capacity — qualities that are useful for coping with the physical changes of pregnancy, childbirth and the postpartum period as well.
Strengthening exercises done with professional guidance are part of Brazil's Ministry of Health recommendations to help prepare the body during pregnancy.
More than exercise: a moment for you
There's also a benefit that doesn't show up easily in numbers.
The class can become a space in your week to step out of your routine, move your body and meet other people going through a similar phase.
In classes for pregnant women, conversations often come up about growing bellies, appointments, baby essentials, sleep, birth and all those 487 new questions that seem to pop up every week. 😅
This sense of connection can also be part of the experience.
To keep in Nilu 🪺
Water aerobics can be a comfortable and enjoyable way to keep moving during pregnancy.
The water helps support part of your body weight, reduces the impact of movements and provides resistance for exercise. For pregnant women without contraindications, moderate-intensity physical activity is part of current recommendations for a healthy pregnancy.
Just don't turn the recommendation into pressure.
Some days you may be full of energy. On others, your body may ask for a slower pace.
Move while respecting your limits, stay hydrated and talk to whoever follows your prenatal care about the most suitable activity for you.
And if a question comes up before a class — “is this okay?”, “is this exercise suitable?”, “what should I ask my obstetrician?” — you can also talk to Luna, the Nilu assistant. She can help you organize your questions for your next appointment.
Sources consulted
- Brazil's Ministry of Health — Brazilian Pregnancy Booklet (“Caderneta Brasileira da Gestante”, 2026): guidance on physical activity during pregnancy, including exercise in the water.
- Brazil's Ministry of Health — Physical Activity Guide for the Brazilian Population: recommendations on physical activity, hydration and contraindications during pregnancy.
- World Health Organization (WHO): physical activity recommendations for pregnant and postpartum women.
- American College of Obstetricians and Gynecologists (ACOG): recommendations on exercise, intensity, hydration, safety and warning signs during pregnancy.