Exercise in Pregnancy

Overview

This article reports what NHS guidance says. It is not a substitute for your midwife or maternity team, and pregnancy is the clearest case in fitness where general advice has to give way to someone who knows your circumstances.

With that said, the headline is more permissive than most people expect. NHS guidance is to keep up your normal daily physical activity or exercise for as long as you feel comfortable doing it.

Quick Answer

NHS guidance is to continue normal physical activity during pregnancy for as long as it feels comfortable, using the ability to hold a conversation as the intensity guide. It advises against contact sports, scuba diving, exercise above 2,500m, and lying flat on your back for long periods, particularly after 16 weeks.

Key Points

Keep doing what you already do, for as long as it stays comfortable.
The conversation test is the intensity guide: talk while you train.
Do not exhaust yourself. That is the explicit wording.
Specific things to avoid are listed, and they are not "lifting".
Your maternity team's advice overrides anything on this page.

What the guidance says

NHS guidance frames exercise in pregnancy as continuing, not starting something new and strenuous. It names walking, swimming, yoga, dancing and cautious cycling, and suggests around 30 minutes of walking a day as a baseline while noting that any amount is better than nothing.

Swimming gets a particular mention, because the water supports the extra weight.

The intensity guide

The rule given is simple and useful: you should be able to hold a conversation as you exercise. If you are too breathless to talk, you are working too hard.

Alongside it sits a plain instruction: do not exhaust yourself.

You can	You are probably
Talk in full sentences	About right
Talk in short sentences	At the upper end
Not talk	Too hard for pregnancy

What to avoid

NHS guidance is specific about these:

Avoid	Why
Contact sports, such as kickboxing, judo or squash	Risk of impact
Scuba diving	The baby has no protection from decompression sickness
Exercise above 2,500m altitude	Altitude sickness risk
Lying flat on your back for long periods	Particularly after 16 weeks
Anything with a falling risk	Horse riding, downhill skiing, ice hockey, gymnastics and cycling, with caution

Note what is not on that list: resistance training. The guidance is about impact, falling, altitude and pressure, not about weights.

Applying it in a gym

This is interpretation of general guidance, not NHS advice, and it is where your maternity team's view matters most.

Reasonable	Reconsider
Continuing lifts you already do, lighter	Starting a new maximal-strength programme
Machines and supported positions	Anything you could fall from or off
Walking, swimming, stationary cycling	Contact sport, or riskier cycling outdoors
Stopping a set well short of failure	Straining, breath-holding, maximal effort
Incline or upright positions later on	Long flat-on-your-back work after 16 weeks

Two practical points. Tell your instructor or coach that you are pregnant, which NHS guidance specifically recommends so they can adapt what you are doing. And expect what is comfortable to change across the three trimesters; the answer in week 8 is not the answer in week 34.

Postpartum

Beyond the scope of this page, and genuinely individual: it depends on the birth, on recovery, and on whether there are complications such as abdominal separation or pelvic floor issues.

The right first step is your postnatal check and, where relevant, a referral to a pelvic health physiotherapist. In much of the UK you can self-refer to physiotherapy without going through a GP.

When to stop and get advice

Speak to your midwife or maternity team if anything feels wrong, and particularly with any bleeding, fluid loss, contractions, dizziness, chest pain, headache, calf pain or swelling, or reduced movements from the baby.

NHS guidance is to check with your maternity team if you are unsure about anything. That is the correct default here, not a formality.

Common Mistakes

Mistake	Why it causes problems	Better approach
Stopping all activity on finding out	Guidance says keep going while comfortable	Continue, adjusted
Starting something new and hard	Pregnancy is not the time to begin maximal training	Continue what you know
Training to breathlessness	Fails the conversation test	Keep it conversational
Not telling your instructor	They cannot adapt what they do not know	Tell them
Taking a wiki over your midwife	Your team knows your circumstances	Ask them

Frequently Asked Questions

Can I exercise while pregnant?

NHS guidance is to keep up your normal daily activity or exercise for as long as you feel comfortable, and that any amount is better than nothing.

How hard should I train?

Use the conversation test: you should be able to talk while exercising. The guidance also says plainly not to exhaust yourself.

Can I lift weights while pregnant?

Resistance training is not among the activities the guidance names to avoid, which are about impact, falling, altitude and diving. How you should adapt it is a conversation for your maternity team.

What should I avoid?

Contact sports, scuba diving, exercise above 2,500m, lying flat on your back for long periods particularly after 16 weeks, and activities with a falling risk.