The months before you conceive are the most useful and most overlooked window in the pregnancy journey. It is the one stretch where you have the fewest restrictions, the most energy, and the most control over what fitness practices and routines you build.
The research supports paying attention here. A 2023 umbrella review in BJOG (British Journal of Obstetrics and Gynecology (now officially titled BJOG: An International Journal of Obstetrics and Gynecology)) covering 21 systematic reviews and 54 randomized trials found that exercise was more effective at reducing gestational diabetes and gestational hypertension when it started early — in the first trimester rather than mid-pregnancy. Observational studies have consistently found that women who were physically active in the six to twelve months before conceiving have a lower rate of gestational diabetes than women who were not.
That does not mean you have missed your chance if you are already pregnant. It means that if you are planning to get pregnant, focusing and getting started sooner rather than later on a fitness routine is worth the effort.
Start with your provider, not with a program
Before you change anything about your exercise routine, see your OB-GYN, midwife, or primary care provider. This is not a formality, and it is not me covering myself. Seeing your primary care provider is the step that determines what the rest of this guide means for you.
A preconception visit is the right time to:
- Review any medications you take, including supplements, and ask which ones need to change before or during pregnancy
- Get baseline blood pressure, A1c or fasting glucose, and thyroid function if you have any history of concern
- Discuss any prior pregnancy complications — preeclampsia, gestational diabetes, preterm birth, pregnancy loss
- Ask directly: are there activities I should not be doing, now or once I am pregnant?
I am a certified health coach and trainer. I am not a licensed healthcare provider. I do not clear anyone for exercise, and neither does any other coach. Your provider does that. What I do is help you build and take action on the plan once you have clearance for exercise.
If you are starting from scratch
You do not need a gym, a program name, or a transformation. You need a floor you can stand on. Here is a twelve-week ramp that gets most sedentary clients to the general adult activity target.
Everything below works for most. Everyone starts at their own level of fitness. The important piece is starting wherever you are and building from your starting point. Don't compare yourself to anyone else; personally, I recommend avoiding social media. Work with your healthcare provider, and then engage with a certified fitness trainer and/or health coach if you need or want more support. The modifications in this series are about mechanics — balance, joint load, breathing, how a growing belly changes leverage — not about body type. A squat to a chair is a squat. It's that simple.
Weeks 1–4: Build a consistent habit, not the fitness. Walk 10 to 15 minutes after two meals a day, most days. That's it. Post-meal walking is useful for blood sugar regulation, and it is short enough that you will actually do it. Add daily pelvic floor muscle training — see the note below on getting taught properly by a pelvic health physical therapist.
Weeks 5–8: Extend. Bring one of those walks up to 25 or 30 minutes and pick up the pace enough that you are breathing harder but can still hold a conversation. That conversation test is the intensity gauge you will use for the next two years, so learn it now. Aim for around 150 minutes a week total (3 times a week).
Weeks 9–12: Add resistance. Two days a week of strength work, 20 to 30 minutes. Squat to a box or chair, a hip hinge, a push, a pull, a carry. Bodyweight and bands are fine to start. This is the piece most people skip and the piece that matters most later, because in pregnancy it is far easier to maintain strength than to build it.
On pelvic floor training: The 2019 Canadian guideline recommends pelvic floor muscle training but adds a condition that gets dropped in most online advice — instruction in proper technique is needed to get the benefit. A large share of women who think they are doing a Kegel are doing something else, usually bearing down or gripping their glutes. Get one session with a pelvic health physical therapist before pregnancy if you can. It is the highest-value hour in this entire series.
If you are already active
Keep going. There is no reason to taper down in anticipation of pregnancy, and the American College of Obstetricians and Gynecologists (ACOG) is explicit that women who habitually do vigorous aerobic activity can continue it through pregnancy and postpartum.
Two things to audit while you have the flexibility:
Are you actually doing strength training? Many active women are cardio-only. Two sessions of strength training a week now will pay off in the third trimester, during labor, and in postpartum recovery when carrying, lifting, and getting up off the floor become your whole day.
Are you eating enough for what you are doing? Low energy availability — training volume that outpaces intake — affects menstrual function, bone density, and fertility. If your cycle is irregular or absent and you train hard, that is a conversation to have with your provider before you start trying to conceive, not after. This is a common and under-discussed issue in athletic women, and it is fixable.
If you have obesity, diabetes, hypertension, or PCOS
This is where the preconception window earns its keep, because it is the one time you can address these conditions without also managing a pregnancy. Meet with your healthcare provider for specific guidance if you have any of these or other health issues.
Higher BMI. Pre-pregnancy weight is one of the stronger predictors of gestational diabetes and hypertensive complications. Weight loss before conception can meaningfully change your risk profile in a way that weight loss during pregnancy cannot, since pregnancy is not a time for intentional weight loss. Be careful about what you promise yourself here. That same 2023 umbrella review found that exercise interventions did not reduce hypertensive disorders in women who were overweight or obese, even though they did in the overall population. Exercise is still worth doing for glucose control, cardiovascular fitness, mood, and function.
Prediabetes or type 2 diabetes. Get your glucose control sorted before conception, with your care team. Post-meal walking, resistance training, and consistent sleep all move this in a positive direction. Exercise improves insulin sensitivity for roughly 24 to 48 hours after a session, which is why frequency beats duration. Consistency and frequency play a big part in improving glucose control.
Chronic hypertension. Uncontrolled hypertension is an absolute contraindication to exercise in pregnancy. Controlled hypertension usually is not. Getting it controlled and stable now, on a medication regimen that is appropriate for pregnancy, is the goal — and some blood pressure medications need to be switched before conception. Discuss the appropriate action to take with your healthcare provider.
PCOS. Resistance training and moderate aerobic activity improve insulin sensitivity and can support ovulatory function. Progress here is measured in months, which is another argument for starting before you are trying to get pregnant.
What to watch for
Even before pregnancy, stop and call your provider if you get chest pain, unusual shortness of breath at rest, dizziness or fainting, calf pain or swelling, or a headache that does not resolve with rest.
Fuel
Full nutrition guidance is its own subject and gets its own post. For now, the part that intersects directly with training:
Eat enough to support what you are building. This is the piece active women get wrong most often. Training volume that outpaces intake affects menstrual function, bone density, and fertility — so if your cycle is irregular or absent and you train hard, that is a conversation with your provider before you start trying, not after.
Eating a balanced diet and taking the recommended amounts of vitamins and minerals will increase the likelihood of a healthy baby.
Recover
Sleep is the piece many people skip. Seven to nine hours, and fix it now — it only gets harder from here.
Take an honest read on your mental health. A history of depression or anxiety is a real risk factor for perinatal mood disorders, and flagging it with your provider before conception means a plan exists before you need one.
Get your dental care and vaccinations current. And look at your stress load with a clear eye. Decide what comes off the plate before the pregnancy, not after.
My health coaching practice draws on Western, Eastern, and alternative approaches. If you already work with acupuncture, bodywork, or another practice outside conventional care, keep it up — and make sure every practitioner knows what the others are doing. That coordination is what makes a combined approach work to best benefit you and your baby.
In summary
Six months of consistent, unremarkable activity before conception does more for a pregnancy than any product, protocol, or supplement marketed to expectant mothers. Walking, some strength work, enough food, enough sleep, and a real conversation with your healthcare provider is a simple and practical approach. It's never too early to start.
Next: Part 2 — During Pregnancy: Keep Going, Modify as You Go — what changes once you are pregnant, what does not, and how to tell the difference.
About the Author
Cynthia Hester is a Certified Health Coach and Fitness Trainer. You can learn more about her practice at cynthiahesterwellness.com.
Published in partnership with Mama Yola — grounded guidance and care that feels human, for fertility through postpartum.
Cynthia Hester is a Certified Health Coach and Fitness Trainer. You can learn more about her practice at cynthiahesterwellness.com. Published in partnership with Mama Yola — grounded guidance and care that feels human, for fertility through postpartum.
Sources
American College of Obstetricians and Gynecologists (ACOG). Physical Activity and Exercise During Pregnancy and the Postpartum Period. Committee Opinion No. 804. Obstet Gynecol. 2020;135:e178–e188.
Mottola MF, Davenport MH, Ruchat SM, et al. 2019 Canadian guideline for physical activity throughout pregnancy. Br J Sports Med. 2018;52(21):1339–1346.
Martínez-Vizcaíno V, et al. Exercise during pregnancy for preventing gestational diabetes mellitus and hypertensive disorders: an umbrella review of randomized controlled trials and an updated meta-analysis. BJOG. 2023;130(3):264–275
Tobias DK, Zhang C, van Dam RM, Bowers K, Hu FB. Physical activity before and during pregnancy and risk of gestational diabetes mellitus: a meta-analysis. Diabetes Care. 2011;34(1):223–229.
Mountjoy M, et al. Relative Energy Deficiency in Sport (RED-S) consensus statement. Br J Sports Med. 2014.
Institute of Medicine and National Research Council. Weight Gain During Pregnancy: Reexamining the Guidelines. Washington, DC: National Academies Press; 2009.
This post is general education, not medical advice. Talk with your obstetric or primary care provider before starting or changing an exercise routine.
