Pregnancy Exercise: What's Safe and What to Avoid

Exercise during pregnancy is safe, beneficial, and recommended - but it comes with caveats. Here's what the evidence says about staying active, what to avoid, and how to listen to your body.

The benefits

The RCOG (Royal College of Obstetricians and Gynaecologists) recommends that pregnant women aim for 150 minutes of moderate-intensity activity per week. Regular exercise reduces the risk of gestational diabetes, pre-eclampsia, and excessive weight gain. It improves mood, reduces anxiety, and helps with sleep. It builds the stamina you'll need for labour and supports faster postpartum recovery.

Exercise is not dangerous for your baby. Moderate exercise does not increase the risk of preterm birth, low birth weight, or complications in healthy pregnancies.

What's safe throughout pregnancy

Walking. The simplest and most accessible exercise. Free, adjustable to your energy level, and suitable at every stage.

Swimming. Many pregnant women find swimming the most comfortable exercise because the water supports your weight and reduces tension on your joints. Aquanatal classes are available in many areas.

Prenatal yoga. Focuses on breathing, stretching, and gentle strengthening. The breathing techniques transfer directly to labour.

Prenatal Pilates. Strengthens your core, back, and pelvic floor. Particularly good for preventing and managing back pain.

Stationary cycling. The bike supports your weight and there's no fall risk. Keep the intensity moderate.

Light strength training. If you were doing strength training before pregnancy, you can generally continue with modifications. Reduce the weight, avoid lying flat on your back after the first trimester, and skip exercises that put pressure on your abdominal muscles.

What to modify or avoid

High-impact sports after the first trimester. Activities with a risk of falling or abdominal impact (horse riding, skiing, contact sports) are best avoided.

Lying flat on your back after week 16. The weight of your uterus can compress the vena cava (the two largest veins in the human body), reducing blood flow.

Hot yoga or exercising in extreme heat. Stay hydrated and exercise in well-ventilated spaces.

Scuba diving. Not safe during pregnancy due to decompression risks.

Listening to your body

Exercise should feel good, not punishing. If something hurts, stop. If you're too breathless to hold a conversation, ease off. If you feel dizzy, nauseous, or experience any vaginal bleeding, stop immediately and contact your midwife.

Your capacity will change throughout pregnancy. Adapt as you go.

Pelvic floor exercises deserve special mention. Strong pelvic floor muscles support your growing uterus, help during labour, and significantly reduce the risk of incontinence after birth. Aim for 3 sets of 10 squeezes daily.

Starting from scratch

If you weren't exercising before pregnancy, now is still a good time to start - just begin gently. Walking, swimming, and prenatal yoga are all safe starting points. Tell your midwife you'd like to start exercising so they can give personalised advice.

The permission you might need

If you're feeling guilty about resting instead of exercising, stop. Growing a human is exercise. Some days, the sofa is exactly where you need to be. Trust your body - it knows what it needs.