There is a stubborn myth that pregnancy is a season for putting your feet up. In truth, for most women, staying active is one of the most powerful — and enjoyable — things you can do for your changing body and your baby. The question was never whether to move, but how to move well as your body evolves week by week.
First, the reassurance
For an uncomplicated pregnancy, exercise is not only safe but actively encouraged by the NHS and the Royal College of Obstetricians and Gynaecologists. Staying active can ease back pain, lift your mood, improve your sleep, support healthy weight gain and reduce the risk of gestational diabetes — and it helps prepare your body for the marathon of labour and the fourth trimester beyond it. The golden rule: get the go-ahead from your midwife or GP, then work with someone who genuinely understands the pregnant body.
The first trimester: steady as you go
If you exercised before, you can usually continue — gently. This is the trimester of nausea and bone-deep tiredness, so give yourself grace on the days your body asks for rest. It is also the perfect moment to build the habits that will carry you through: a strong, well-connected core and pelvic floor, good posture, and a calm relationship with movement rather than a punishing one.
The second trimester: your window of energy
For many women this is the sweet spot — nausea lifts, energy returns and you still move with ease. It is a wonderful time to build strength: think supported squats, lunges, resistance work and everything that prepares you to carry and, later, to lift a baby all day. Two adjustments matter here: avoid lying flat on your back for long periods after around 16 weeks, and swap traditional sit-ups for deep-core work that protects against abdominal separation.
The third trimester: move to feel good
As your bump grows, the goal shifts from building to maintaining — and to feeling as comfortable as possible. Lower-impact strength, mobility for aching hips and backs, breathing practice and pelvic-floor work all come into their own now, quietly preparing you for birth and recovery. Balance changes as your centre of gravity shifts, so this is the time to train smart, not hard.
When to stop and call your midwife
Movement should make you feel better, not worse. Stop and seek advice if you experience vaginal bleeding, regular painful contractions, dizziness, chest pain, calf pain or swelling, fluid leaking, or reduced baby movements. When in doubt, always check in — a good specialist will never push you past what feels safe.
Pregnancy training in Battersea, Chelsea and Clapham
I work privately with expectant mums across Battersea, Chelsea and Clapham — at home, in the park, or online — adapting every session to your trimester, your energy and your goals. No crowded gym, no guesswork, just safe, expert coaching that meets you exactly where you are. Explore pre & postnatal personal training in South West London