If you were not active before pregnancy, the NHS advises not suddenly taking up strenuous exercise: start with no more than 15 minutes of continuous exercise, three times a week, and build gradually towards at least four 30-minute sessions a week.[1] The NHS gives the start and the goal, not the steps in between, so the progression below is only an illustration.
| Illustrative week | Sessions | Total per week |
|---|---|---|
| Week 1 | 3 × 15 min | 45 min |
| Week 2 | 3 × 20 min | 60 min |
| Week 3 | 3 × 25 min | 75 min |
| Week 4 | 3 × 30 min | 90 min |
| Week 5 | 4 × 30 min | 120 min |
Keep to the talk test (you should be able to hold a conversation), and check with your midwife or doctor before starting.[1]
The NHS says exercise is not dangerous for your baby, and suggests keeping up your normal activity for as long as you feel comfortable. If in doubt, consult your maternity team.[1]
The NHS suggests you should be able to hold a conversation as you exercise; if you become breathless while talking, you are probably exercising too strenuously.[1]
The NHS advises not suddenly taking up strenuous exercise. Tell the instructor you are pregnant and begin with no more than 15 minutes of continuous exercise, three times a week, increasing gradually to at least four 30-minute sessions a week.[1]
The NHS advises not lying flat on your back for prolonged periods, particularly after 16 weeks, and avoiding contact sports such as kickboxing, judo or squash, scuba diving, and exercising at heights over 2,500m until you have acclimatised. It advises caution with activities that risk falling, such as horse riding, downhill skiing, ice hockey, gymnastics and cycling.[1]
Yes. The NHS says all pregnant women should do them, even if you are young and have no symptoms.[1]
Pregnancy is not the time to stop moving — it’s the time to move smarter. The NHS says exercise is not dangerous for your baby, and suggests keeping up your normal daily activity or exercise for as long as you feel comfortable.[1] If in doubt, consult your maternity team.[1]
Of course, pregnancy changes your body significantly, and the exercise that's appropriate in week 8 is very different from what's appropriate in week 36. Here's a trimester-by-trimester guide to safe, effective prenatal movement — based on general guidance from health organizations. Check with your own healthcare provider before starting any exercise.
The benefits of staying active during pregnancy are well-documented and significant:
Before we get into trimester-specific exercises, here are the ground rules that apply throughout pregnancy:
The first trimester is often the hardest for exercise — not because it's medically dangerous, but because nausea, fatigue, and exhaustion make getting off the couch feel impossible. If that's where you are, be gentle with yourself. Even a 10-minute walk counts.
If you were exercising before pregnancy, you can generally continue at the same level in the first trimester with some modifications. If you weren't exercising, now is a great time to start with low-impact activities.
The most accessible and underrated pregnancy exercise. A brisk 30-minute walk daily counts as your recommended aerobic activity and can be done at any fitness level, in any trimester. Start your day with a walk to boost energy and ease morning nausea — many women find that gentle movement actually helps with nausea more than resting does.
Water exercise is ideal in pregnancy. The buoyancy reduces pressure on your joints, the water keeps you cool, and swimming provides excellent full-body cardiovascular conditioning without impact. Water aerobics classes specifically designed for pregnant women are widely available and allow you to maintain intensity while minimizing discomfort.
Prenatal yoga builds flexibility, balance, and core strength while incorporating breathing techniques that are invaluable during labor. It's also one of the best tools for managing pregnancy anxiety. Look for classes specifically labeled "prenatal yoga" — they avoid poses that compress the abdomen or require lying flat on the back for extended periods.
Great for cardiovascular fitness without the fall risk of outdoor cycling. As your belly grows, adjust the seat and handlebar height to maintain comfort. Keep intensity moderate.
Many women feel their best in the second trimester — nausea has typically eased, energy returns, and the bump is visible but not yet burdensome. This is a wonderful window to be active. Keep up with first trimester activities and add these:
Your pelvic floor supports your bladder, bowel and uterus. Pelvic floor exercises help reduce or avoid stress incontinence after pregnancy, and the NHS says all pregnant women should do them, even if they are young and have no symptoms. It suggests three sets of eight squeezes a day.[1]
Light to moderate strength training is safe and beneficial in the second trimester. Focus on functional movements: squats, lunges, rows, shoulder presses, and modified push-ups. Use lighter weights with higher repetitions. Avoid exercises that require lying flat on your back — use an incline bench or perform seated or standing alternatives.
Pilates focuses on core strength, posture, and controlled movement — all of which are particularly valuable as your center of gravity shifts. Modified Pilates (avoiding supine positions after week 20) can significantly reduce back pain and improve body awareness through pregnancy and delivery.
Low-impact dance classes designed for pregnancy are joyful, social, and excellent cardio. They also support coordination and body confidence as your shape changes.
By the third trimester, your center of gravity has shifted significantly, your ligaments are more relaxed (due to the hormone relaxin), and your lung capacity is reduced as the baby pushes up on your diaphragm. Exercise should become gentler and more intentional — but it should not stop.
Still the gold standard. Even short, gentle walks support circulation, reduce swelling in the legs and feet, and may help encourage the baby into optimal position for birth. Walking also releases endorphins that help manage third trimester discomfort and anxiety about labor.
Even more beneficial in the third trimester, when the water's buoyancy provides relief from the weight of pregnancy. Many women find swimming one of the few exercises that feels truly comfortable at 32+ weeks.
Focus on hip openers, gentle spinal stretches, and breathing exercises. Cat-cow stretches, supported squats, and child's pose (widened to accommodate the belly) are excellent for relieving lower back and hip tension common in late pregnancy.
Sitting and gently bouncing on a birth ball helps relieve pelvic pressure and encourages optimal fetal positioning. Hip circles on the ball can ease back pain and are also used as a labor support tool. Many hospitals and birthing centers have birth balls available during labor.
Stop exercising immediately and contact your healthcare provider if you experience:
While most moderate exercise is safe, certain types carry specific risks during pregnancy that make them unsuitable, particularly beyond the first trimester:
Fatigue and nausea may make exercise feel challenging. Don't force intense sessions — listen to your body. Walking, gentle yoga, swimming, and light resistance training are all appropriate. Avoid very high-impact activities if you're at increased risk of miscarriage (discuss with your doctor), but for most uncomplicated pregnancies, continuing pre-pregnancy exercise at the same level is safe.
Many people find this a comfortable trimester for exercise, but it varies. Keep to what feels comfortable, and consult your maternity team if in doubt.[1]
Modify as needed. Your centre of gravity has shifted, balance is affected, and joints are more mobile due to relaxin hormone — increasing injury risk in sudden movements. Reduce impact, prioritise walking, swimming (excellent throughout pregnancy), and prenatal yoga. Pelvic floor exercises are particularly valuable in this trimester.
The evidence for exercise during pregnancy is clear and consistent:
Unless your midwife or doctor has advised you to reduce activity due to a specific pregnancy complication, regular moderate exercise is one of the most beneficial things you can do for yourself and your pregnancy.
Use our free Pregnancy Due Date Calculator to know exactly which trimester you're in and track key milestones.
Check My Pregnancy Week →Moving your body during pregnancy is one of the most loving things you can do for yourself and your baby. Find activities you genuinely enjoy, listen to your body's feedback, and don't be afraid to modify as your pregnancy progresses. Every trimester brings its own movement possibilities — and the goal is consistency, not intensity.