Is swimming safe during pregnancy?

Swimming is not just safe during pregnancy — it is widely considered one of the best forms of exercise you can choose. The NHS specifically recommends it as an ideal pregnancy exercise, and it remains appropriate right up to your due date. Many women who find other forms of exercise uncomfortable as their bump grows find that swimming remains comfortable and enjoyable throughout all three trimesters.

Why swimming is so well-suited to pregnancy

Several features of swimming make it uniquely beneficial during pregnancy:

Buoyancy supports your body weight. Water supports approximately 90% of your body weight when submerged to the chest. This removes the gravitational load on your joints, pelvis, and lower back that makes many other forms of exercise increasingly uncomfortable as pregnancy progresses. Many women report that the feeling of weightlessness in water provides significant relief from the physical heaviness of late pregnancy.

No fall risk. As the bump grows and the centre of gravity shifts, many women become less steady on their feet, particularly in the third trimester. Swimming eliminates this concern entirely.

No overheating. Overheating is a concern with vigorous land-based exercise and is particularly relevant in the first trimester. Water keeps the body cool naturally, making it very difficult to overheat while swimming at a moderate pace.

Full-body workout. Swimming works the cardiovascular system as well as the muscles of the arms, shoulders, back, core, and legs — providing a genuinely comprehensive workout without impact.

Reduces swelling. The gentle pressure of water on the legs and body can help reduce the oedema (swelling) in the feet and ankles that is common in later pregnancy.

Mental wellbeing. The rhythmic, meditative quality of swimming has been shown to reduce anxiety and stress, which are common companions of pregnancy.

Which strokes are safe?

Front crawl and breaststroke are both safe and commonly used. Front crawl is an excellent full-body aerobic workout. Breaststroke is a little easier to sustain at a gentle pace and many women find it very comfortable in pregnancy. Be aware that in late pregnancy, breaststroke can sometimes exacerbate pelvic girdle pain — if you feel discomfort in your pelvis or pubic area with breaststroke, switch to front crawl or aqua jogging.

Backstroke is safe in the first trimester. From around 16–20 weeks, spending extended time on your back may cause the uterus to compress the vena cava, reducing blood return to the heart. Many women find backstroke uncomfortable as the bump grows in any case. Switching to other strokes is sensible.

Aqua aerobics and aqua jogging are safe and popular options in pregnancy. Many pools offer dedicated antenatal aqua aerobics classes, which are a good social and physical option.

What to avoid

Hot tubs, jacuzzis, and heated pools above 35°C should be avoided during pregnancy. Immersion in very hot water raises core body temperature, which can be harmful to fetal development — particularly in the first trimester. Standard swimming pools are maintained at around 27–30°C and are completely safe.

Diving should be avoided. The impact of entering the water could put stress on the abdomen, and changes in pressure can be problematic.

Vigorous tumble turns in late pregnancy are worth avoiding simply as a precaution against abdominal impact, though gentle swimming throughout the lane is completely fine.

The NHS recommends 150 minutes of moderate activity per week during pregnancy. Swimming briskly enough to slightly raise your heart rate and breathing counts as moderate exercise. A 30-minute swim five times per week would meet this guideline comfortably.

You do not need to swim at speed. A steady, comfortable pace that keeps you moving without becoming breathless is ideal. Use the talk test: if you can hold a conversation (or count aloud) while swimming, you are at a safe intensity.

Practical considerations

  • Swimwear: Maternity swimwear is available and provides more support and comfort than standard swimwear as the bump grows. A well-fitting swimsuit reduces drag and makes swimming easier.
  • Changing facilities: Many pools have accessible changing areas — it is worth asking the pool before your first visit.
  • Entry and exit: Use the pool steps or ladder rather than jumping or diving in. Steps are safer, especially later in pregnancy.

When to stop and seek advice

Stop swimming and contact your midwife if you experience:

  • Abdominal pain or cramping during or after swimming
  • Dizziness, light-headedness, or feeling faint in the water
  • Any vaginal bleeding or fluid leakage
  • Significant shortness of breath at a pace that previously felt comfortable
  • Pelvic girdle pain that is new or worsening