In short. Pregnant women can run under three conditions: you ran regularly before conception, the pregnancy is progressing without complications, and the doctor has no objections. Current clinical guidelines agree: continuing a familiar load is beneficial for the mother and does not harm the foetus in the absence of contraindications. Pregnancy is not the time to start running from scratch: the body is not adapted to impact load, and starting now creates extra risk for joints, ligaments, and the pelvic floor. Experienced runners without complications typically keep running until weeks 24-28 on average, after which they switch to brisk walking, swimming, or the elliptical. Main risks: overheating of the body (above 39°C – risk of foetal developmental defects), impact on the pelvic floor, falls from a shifted centre of gravity and the action of relaxin. Intensity control – via the talk test: you should be able to say a full sentence without losing breath, and stay in RPE 4-6 out of 10. Absolute contraindications: placenta praevia, cervical insufficiency, multiple pregnancy, pre-eclampsia, severe anaemia. After IVF – no running for the first 12 weeks.
A sustained body temperature above 39°C raises the risk of foetal developmental defects – which is why a pregnant runner drinks water before and after every run, picks the cooler hours of the day, and switches to the treadmill at +25°C.
This question gets asked often – and gets opposite answers. Some say: “Run while you can, no big deal”. Others: “What running? You are pregnant, lie down!” The truth, as usual, is more complex. Running during pregnancy is neither categorically forbidden nor unconditionally safe. Everything depends on the specifics: your running experience, the stage, how you feel, the features of the pregnancy, and your doctor’s recommendations.
In this article we will look at this without myths and extremes: who can keep running, who is better off stopping, what to replace running with at different stages, and how to control intensity.
The short answer: it depends on you
There is no universal ban on running during pregnancy. International recommendations say: if a woman ran before pregnancy and the pregnancy is progressing without complications, she can continue to run, adapting the load as the term grows.
The key word is “continue”. Pregnancy is not the time to start running from scratch. If you did not run before, the body is not adapted to impact load, and starting now during pregnancy is an extra risk for the joints, ligaments, and the pelvic floor.
Another key phrase – “without complications”. There are conditions in which running is clearly contraindicated, and no amount of running experience overrides that.
Who can keep running
You can consider continuing to run if:
- You ran regularly before pregnancy – not once every six months, but systematically, at least two or three times a week for several months.
- The pregnancy is progressing without complications – no threatened miscarriage, placenta praevia, cervical shortening, severe gestational diabetes, or pre-eclampsia.
- A doctor has given permission – not formal “well, if you want”, but conscious permission after a discussion of your activity level.
- You feel well – no pain, dizziness, breathlessness, or sense of pressure below.
If these conditions are met, running in early and mid-pregnancy can be safe. But even in that case – with adjustments.
Who should stop
There are clear medical contraindications under which running during pregnancy is forbidden. These include:
- Placenta praevia or a low-lying placenta
- Threatened preterm labour
- Cervical shortening (cervical insufficiency)
- Bleeding in the second or third trimester
- Multiple pregnancy with risk of preterm labour
- Pre-eclampsia or severe hypertension
- Intrauterine growth restriction
- Severe anaemia
In addition to medical contraindications, there are practical signals from the body that mean running has to stop:
- Pain in the lower abdomen or pelvic area during or after running
- Breathlessness that does not pass after stopping
- Dizziness or near-fainting
- Leaking amniotic fluid
- A sense of pressure on the pelvic floor
- Spotting
Any of these symptoms is a reason to stop immediately and contact a doctor. That is not over-caution – it is common sense.
Running during pregnancy by trimester: what changes and what to consider
Running in early pregnancy (first trimester, 1-13 weeks)
Running in early pregnancy is one of the most discussed topics, because many women learn of the pregnancy only after several weeks of their usual training. The short answer: if you ran systematically before conception and the pregnancy is progressing without threat, you can usually keep going. But it is precisely in early pregnancy that there are three specific nuances that do not exist in the second trimester.
Nuance 1. Overheating. The first trimester is a critical period of foetal nervous system formation, and sustained hyperthermia (body temperature above 39°C) raises the risk of developmental defects. It is easy to overheat while running, even at +20°C outside. Rule: run at cooler hours, in breathable clothing, over short distances, and drink water before and during.
Nuance 2. Nausea and fatigue. In the first trimester there is often less energy than you are used to. If the body asks for rest, do not prove anything by force. Skipping a month of running is not critical; in the third trimester you will switch to walking anyway.
Nuance 3. Implantation and the very early period. The first 4-6 weeks after conception are the time of placenta formation. Most guidelines do not prohibit a familiar load but recommend lowering the intensity by 10-20% until normal implantation is confirmed on the first ultrasound. This is especially relevant in pregnancy after IVF – see «Training and conception».
Lower the intensity: run slower than usual. Shorten long runs. Replace one running session a week with brisk walking or swimming – this reduces impact load without losing the cardio effect.
Running in early pregnancy week by week: what changes inside the trimester
The first trimester is not a uniform stretch. Each week has its own features, and this affects running.
| Week | What is happening in the body | What this means for running |
|---|---|---|
| 1-4 weeks | Embryo implantation into the uterine wall, the beginning of the gestational sac. Most do not yet know they are pregnant. | Training continues as usual, but if pregnancy is planned – do not raise the load and body temperature (sauna, banya, running in the heat). |
| 5-6 weeks | Pregnancy confirmation. Start of the embryonic period. Nausea often appears. | Lower the intensity by 10-20% even if you feel well. The first ultrasound is usually done in this week – until it confirms normal implantation, many guidelines recommend limiting impact load. |
| 7-8 weeks | Active formation of the cardiovascular system and neural tube. Peak of nausea for many. | The main risk is overheating. Run at cool times, in light clothing, with plenty of fluids. At +25°C outside, switch to the treadmill. |
| 9-10 weeks | Formation of the main organs is completed. Blood volume starts to rise, the pulse goes up by 5-10 beats even at rest. | The usual pace requires more effort – this is normal, do not be alarmed. Use the talk test, not the pulse. |
| 11-13 weeks | First screening. Energy often returns. Relaxin starts to work – ligaments become more elastic. | You can return to your usual volume if there are no contraindications. A sense of “lightness” in the joints appears – that is relaxin, be careful with sharp movements. |
In pregnancy after IVF, most protocols recommend excluding running and any impact load for the first 12 weeks – until normal progress of the first trimester is confirmed.
Running in the second trimester (13-27 weeks)
For many this is the most comfortable period for running. Nausea has receded, energy is back, the belly is not yet too large. Running can feel quite normal – especially if you continued to run through the first trimester as well.
What changes in the second trimester: the centre of gravity starts to shift, ligaments become more elastic (relaxin at work), the load on joints and the pelvic floor grows. Pick level routes, avoid off-road and slippery surfaces. Use a supportive belt if you feel discomfort. From weeks 20-22 many switch from asphalt to the treadmill – less risk of falling.
Running in the third trimester (28-40 weeks)
Here most runners switch to walking or other forms of activity. The belly is large, breathing is harder, joints are loaded, the pelvic floor is under maximum pressure. Running becomes physically uncomfortable and may be potentially risky – the risk of falling and pelvic floor load outweigh the benefits.
Some women keep doing light runs in the third trimester – if they feel well and the doctor has no objections. But this is rather an exception. Switching to walking is not a sign of weakness, but a reasonable adaptation. After week 32 even experienced runners are advised to switch fully to walking, swimming, or the elliptical.
Decision tree: can I run today
When I work with running clients during pregnancy, we use a simple algorithm that is checked before every run:
-
Any spotting, lower abdominal or rib pain, dizziness, leaking amniotic fluid?
- Yes → stay home, call your doctor.
- No → go to step 2.
-
Was there a long session yesterday that you have not fully recovered from?
- Yes → a 30-40 minute walk instead of running.
- No → go to step 3.
-
Is the air temperature above +25°C or below 0°C?
- Yes → treadmill in the gym or switch to walking/swimming.
- No → go to step 4.
-
Are you past 28 weeks?
- Yes → only if your doctor has no objections, you have a habit of running, and you feel well. A short 20-30 minute run at a comfortable pace.
- No → go to step 5.
-
Do you feel normal, with no breathlessness at rest and no acute nausea?
- Yes → run. 10-20% lower intensity than usual. Apply the talk test during the run.
- No → walking or rest today.
This algorithm covers 90% of daily decisions. In complex cases (twins, after IVF, threatened miscarriage in history, any pathology) – agree with the obstetrician before starting training.
A case from practice: a runner after IVF
Last year a client came to me – an experienced runner with three years of regular runs, pregnant after IVF. Her experience gave her a base of conditioning, but the IVF protocol required excluding impact loads in the first trimester. The plan: the first 12 weeks – brisk walking and the elliptical (4-5 times a week, 40 minutes each), keeping cardio fitness without running. From week 13, after the first screening and the doctor’s clearance, we brought back slow running 2 times a week, 25 minutes on the treadmill. From week 28 we gradually moved to brisk walking and swimming. The baby was born at term, and recovery to her usual running volume took 4 months postpartum after passing a pelvic floor jump test. The main takeaway: a reasonable adaptation gives a better result than “I will run as before” or “I will stop moving altogether”.
How to control intensity
During pregnancy, the usual load metrics can be misleading. The pulse in pregnant women is elevated anyway, blood volume is up, breathing is faster. Here are more reliable guides.
The talk test: you should be able to maintain a conversation while running. If you are out of breath and cannot say a full sentence, the intensity is too high.
The Rate of Perceived Exertion (RPE) scale: rate the effort on a ten-point scale. During pregnancy it is recommended to stay in the range of four to six – moderate load where you feel effort but not exhaustion.
Body temperature: avoid overheating. Run at cool times of day, drink water before, during, and after, wear breathable clothing. If you feel hot and dizzy – stop.
Recovery: after a run you should feel pleasant fatigue, not a wreck. If you feel wrecked by the evening – lower the load.
What to replace running with
If running has become uncomfortable or the doctor recommends stopping, this does not mean giving up movement. There are great alternatives that provide cardio load without impact:
- Brisk walking – the closest movement to running but without impact on joints and the pelvic floor. You can walk in any trimester.
- Swimming – water removes load from joints and spine and supports the body. One of the most recommended activities during pregnancy.
- Stationary bike – excludes impact load and lets you control intensity. A road bike is less safe due to the fall risk.
- Elliptical – smooth movements without an impact phase. A good option for those used to cardio.
- Specialised fitness for pregnant women – programmes adapted to each trimester, with a focus on safety and function.
Moving from running to other formats is not a step back, but an adaptation. Your task is not to preserve running fitness at all costs, but to maintain health and wellbeing throughout pregnancy.
More about which activities suit pregnancy – in the section on pregnancy and on the safety page.
The main rule: listen to your body and your doctor
Running during pregnancy is neither a feat nor a crime. It is one of the options for physical activity that does not suit everyone and not at every stage. Your body will send signals: if running feels comfortable – good. If not – switch to another format without guilt.
Do not follow bloggers who run marathons at eight months. And do not listen to those who say “lie down and do not move”. Your situation is unique, and the decision should be based on your health, experience, and the recommendations of your specialists.
If you want to figure out whether you can keep running, what to replace running with, or how to adapt the load – book the intro session. We will discuss your situation, take your doctor’s recommendations into account, and put together a movement programme that is safe and comfortable.
The intro session costs from 1,400 rubles (online).
