Exercise in Pregnancy: What to Change, Trimester by Trimester

By the Circle Physiotherapy Clinical Team · 9 min read

Medically reviewed August 2026 by registered physiotherapists at Circle Physiotherapy Brampton.

Quick answer: If your pregnancy is uncomplicated, keep exercising and modify rather than stop. Skip prolonged flat-on-your-back positions after the first trimester, remove fall and contact risk, judge intensity with the talk test instead of a heart-rate target, and back off anything that makes your abdomen cone. Walking and strength training usually continue throughout.

Most pregnancy exercise advice stops at ask your doctor and take it easy, which tells you nothing useful about Tuesday's workout. Current Canadian guidance is far more encouraging: if your pregnancy is uncomplicated, staying active through all three trimesters is recommended, and people who keep training tend to report less back and pelvic pain rather than more. What changes is not whether you exercise but how — positions, impact, intensity cues and load management all need adjusting as the weeks go on. This is a practical guide to those adjustments, written with Divya Sreejith, the pelvic floor physiotherapist at Circle Physiotherapy in Brampton.

Is it actually safe to keep exercising while pregnant?

Yes — for an uncomplicated pregnancy, current Canadian guidance actively encourages physical activity throughout, on most days of the week, rather than treating rest as the safe default. That is a real change from the advice a generation ago, and it matters, because doing nothing carries its own costs.

Exercise in pregnancy is associated with less low back and pelvic girdle pain, not more, alongside better sleep, mood and blood-sugar control. If you already train, the goal is to keep going in a modified form. If you do not, pregnancy is a perfectly reasonable time to start gently — walking, swimming, prenatal strength work — provided you build up over weeks rather than days.

What actually needs to change about my training?

Five modifications cover most of it: stop training flat on your back for prolonged periods after the first trimester, remove meaningful fall and contact risk, stop any movement that makes your abdomen cone or dome, judge intensity by whether you can still hold a conversation rather than by a heart-rate number, and reduce wide-legged and deep-squat loading if you have pelvic girdle pain.

The supine rule exists because the weight of the uterus can press on the large vein returning blood to your heart and leave you light-headed; a brief set is usually fine, a long floor sequence is not. Heart-rate targets are unreliable here because resting rate and blood volume both shift. Coning is a pressure signal rather than damage — our diastasis recti page explains what to do about it.

What should I change in each trimester?

Broadly: the first trimester changes little, the second is where positions and impact get modified, and the third is about managing load, balance and comfort. Treat the table as a starting point rather than a rulebook, because symptoms beat the calendar every time.

Two symptoms override the whole table. Heaviness or dragging in the vagina and leaking urine both say the load is currently more than your pelvic floor can manage, so reduce impact, range or weight instead of pushing through. Our bladder leakage page covers why that happens.

Can I keep lifting weights while I am pregnant?

Yes — strength training through pregnancy is generally safe and genuinely useful, and there is no need to swap your programme for light dumbbells. What matters is technique and load management: keep breathing through effort instead of holding your breath and bearing down, and let symptoms and recovery guide the weight on the bar.

In practice that means exhaling on the hard part of every lift, dropping maximal attempts, widening or shortening your stance as the bump grows, and moving to a trap bar, elevated deadlift or goblet position once a barbell no longer clears comfortably. Expect to reduce load through the third trimester while keeping the movement pattern — that is sensible management, not decline. Carries, rows, presses and split squats stay useful almost to the end.

What core work should I keep, and what should I swap?

Keep the core work that builds tension without spiking pressure, and swap out anything that loads a lengthening abdominal wall through a long lever. Bird dogs, side planks with the bottom knee bent, pallof presses, loaded carries and breath-led deep abdominal work all stay in.

What goes: sit-ups, crunches, double-leg lowering, hanging leg raises and long front planks — usually in the second trimester, and earlier if you see coning. Every abdominal wall stretches to make room for a baby, so the aim is to keep it working rather than to prevent it. If your bump pushes up into a ridge along the midline, change one variable — smaller range, exhale through the effort, less load — instead of dropping core training.

Should I train my pelvic floor before birth?

Yes, and the part most people miss is learning to fully relax it, not only to contract it. Pelvic floor training during pregnancy is widely recommended and is associated with better bladder control late in pregnancy and afterwards, but a floor that can only grip is not well prepared for a vaginal delivery.

So prenatal pelvic floor physiotherapy trains two separate skills. Strength: squeeze and lift, hold for several seconds, then fully let go, a few times a day. Release: breathe in low and wide and feel the muscles soften and open, which is the skill the pushing stage actually calls on. Divya is certified through all three pelvic health levels and can tell you whether you are contracting correctly — something no leaflet can do. Every appointment is with a female clinician in a fully private room.

When should I stop a session and call someone?

Stop exercising and contact your obstetrician, midwife or emergency care — not our clinic — if you have vaginal bleeding, fluid leaking from the vagina, regular contractions before term, reduced or changed fetal movements, a severe headache with visual changes, or calf pain and swelling. Those are medical concerns, not training problems.

Some conditions change this conversation entirely. Placenta praevia and cervical insufficiency are absolute contraindications to moderate or vigorous exercise, so training there is directed by your obstetric team rather than simply cleared by them; the same applies to a pregnancy classified as high risk. Bleeding belongs in the paragraph above, as a reason to stop and seek care, not a training decision. Within a session, stop for dizziness, chest pain, breathlessness at rest, painful contractions or a sudden loss of balance. Milder signals — leaking, heaviness, next-day pubic pain — mean modify rather than abandon exercise.

How does physiotherapy fit alongside my training?

Physiotherapy answers what a general guideline cannot: whether a particular ache is worth working around, what your pelvic floor is genuinely doing, and how to keep loading a body that changes shape every fortnight. An assessment should leave you with a training plan, not an instruction to rest.

If pain rather than programme design is the main issue, our pregnancy physiotherapy page covers assessment and treatment of pelvic girdle pain, back and rib pain and hand numbness in detail. Circle Physiotherapy is at 10725 McLaughlin Rd, Unit #5, Brampton, open seven days, with direct billing to major insurers plus WSIB and motor vehicle claims — see insurance and direct billing or what happens at your first visit. Call (905) 495-5600, send us a message, or book online.

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