You Don't Have to Put Your Training on Pause: What the Research Really Says About Exercise in Pregnancy

If you've been told to stop lifting anything over 20 pounds the moment you find out you're pregnant, keep your heart rate under a certain number, or "just wait until after baby" to get back to real training, you're not alone. Those rules have been repeated in doctor's offices and group chats for decades. They're also outdated.

At Rally Physical Therapy, we work with pregnant patients who want to stay strong, stay active, and walk into birth and postpartum feeling capable, not like they spent nine months tiptoeing around their own body. So let's talk about what the research actually says about staying active while you're pregnant.

Where These Old Rules Came From

It helps to know where the old advice came from, because it explains why so much of it no longer holds up. Decades ago, official guidance kept workouts very short and very light, out of caution more than clear evidence. Over the years, as more research came in, that guidance loosened, first to allow moderate exercise with far fewer restrictions, then to actively encourage even women who hadn't been active before pregnancy to start moving.

The research has kept moving since. Here's what today's leading pregnancy and pelvic health experts want you to know.

What the Research Actually Shows

Most exercise is fine for healthy, low-risk pregnancies. Your body does a lot of work behind the scenes to support you and your baby during exercise: your heart pumps more blood, and your body adjusts to protect your baby even as you push yourself. Because of that, walking, strength training, swimming, running, and cycling are all generally on the table throughout a healthy pregnancy. You don't need to grind yourself into the ground, but you also don't need to tiptoe around a moderate workout.

Working harder isn't dangerous; it's actually protective. Research shows that women who exercise at a moderate-to-higher effort during pregnancy have a meaningfully lower risk of preeclampsia (a pregnancy complication involving high blood pressure) and gestational diabetes, compared to those who don't exercise at all.

Core work is safe. A lot of people worry that ab exercises will make diastasis recti worse. That's the natural lengthening that happens in your abdominal muscles as your belly grows to make room for a baby. A study that specifically trained pregnant women's ab and pelvic floor muscles together found it didn't worsen that length. Core training doesn't need to be shelved for nine months out of fear.

Lifting heavier weights doesn't appear to carry the risk it's long been assumed to. A large survey followed people who kept lifting heavy through pregnancy: some working very hard, including competitive weightlifters who trained right up until delivery. It found no increase in pelvic floor problems among those who kept lifting heavy, and those who held their breath while under load weren't more likely to leak or develop prolapse (a heavy, bulging feeling in the pelvis). Very few developed a noticeable diastasis recti. And people who kept training at their pre-pregnancy intensity actually had fewer pregnancy complications than those who scaled way back.

National health guidelines recommend at least 150 minutes of activity a week. A major Canadian guideline, built from a review of tens of thousands of studies, recommends that pregnant women without a specific medical reason to avoid it get at least 150 minutes of moderate activity a week, spread across most days. It specifically encourages pelvic floor exercises as part of that routine to help prevent leaking later on.

"Modify, Don't Stop.” A Better Way to Think About This

One of the researchers behind that Canadian guideline also helped write an article with a simple message: modify, don't stop. Instead of treating a long list of pregnancy conditions as automatic reasons to stop moving altogether, the point is that most of them just call for adjusting your activity, not quitting it. This matches how other leading pregnancy physical therapists approach care: trimester-by-trimester adjustments built around you, rather than a one-size-fits-all list of dos and don'ts.

A good example is placenta previa, which is when the placenta covers the cervix. It's actually common early on, showing up in roughly half of pregnancies around 8–12 weeks, and it resolves on its own in the vast majority of cases as your body grows and changes. Before the third trimester, this diagnosis usually doesn't call for cutting back on exercise. If it hasn't resolved later in pregnancy, a more cautious approach makes sense. Same diagnosis, different guidance depending on timing. That's why a plan built around you with your entire care team matters more than a generic checklist.

The same goes for "pelvic rest," a phrase used loosely that causes unnecessary worry. In practice, it usually means nothing inserted vaginally and avoiding movement that puts a lot of pressure through the pelvis, but it does not automatically mean "stop all exercise." Again, a plan built with the entire care team is the goal.

So How Should You Actually Train?

A few simple principles we lean on with our patients:

Keep lifting, with a plan. Strength training doesn't need to disappear; it just needs to be adjusted thoughtfully as your body changes week to week.

Breathe through the hard parts. Instead of holding your breath through a tough rep, practice breathing out as you move through the effort. It's a skill, and we teach and fine-tune it together in sessions. Also, understand that holding your breath under heavy loads is not automatically bad. There is more nuance, and experience with heavy lifting creates a solid foundation for safe loading. A Pelvic PT is the perfect person to help you do this correctly. 

Go by feel, not a fixed number. Pay attention to how hard something actually feels; aim for a "somewhat hard" effort rather than chasing a specific heart rate. Your effort level will naturally shift week to week, and that's normal.

Keep moving, even if the exercise type needs to change. If running or jumping starts to feel like too much pressure, options like cycling, swimming, or using an elliptical let you keep your fitness up without backing off entirely.

Listen to your body's actual signals, not just the calendar. Leaking, a heavy or bulging feeling in the pelvis, or pain with certain movements are things we can address and work through together. They're not automatically a reason to shut your training down altogether.

Know the signs that mean stop and call your provider.Regardless of trimester, stop exercising and reach out to your OB or midwife right away if you notice vaginal bleeding, fluid leaking, dizziness or fainting, chest pain, calf pain or swelling, or painful, regular contractions. Those are the real warning signs.

Your Body Is Not Something to Handle Delicately for Nine Months

Pregnancy changes your body, that's true, and it deserves respect and a thoughtful plan. But changing i’t the same as breaking. You're allowed to train with intention, lift with good form, and stay connected to the activities that make you feel like yourself, all the way through pregnancy and into postpartum.

If you're dealing with leaking during workouts, pelvic or hip pressure, low back or hip pain, or you just want a clear, personal plan for staying active through each trimester, that's exactly what a pelvic health evaluation is for. We'll look at how you're moving, breathing, and lifting while building a plan around your pregnancy, not a generic list of dos and don'ts.

Ready to keep training with confidence?Schedule an evaluation with Rally Physical Therapy. Let's build a plan that keeps you strong, capable, and moving well, through pregnancy and beyond.

Contact me for a free conversation → https://www.rallyphysicaltherapync.com/contactI’ll answer your questions, explain your options, and help you decide if Rally PT is the right fit for you.

You can also DM me on Instagram with any questions. I personally read every message: https://www.instagram.com/juliepittman.dpt/

This post draws on research and guidance from leading voices in pregnancy and pelvic health care, including Kari Bø (researcher and physical therapist known for her work on exercise and the pelvic floor during pregnancy), Margie Davenport (an exercise physiologist who helped lead Canada's national guideline on physical activity during pregnancy), Gráinne Donnelly (a physiotherapist known for her approach to pregnancy and postpartum athletic care), and Dr. Rachel Selman, DPT (a pelvic health physical therapist focused on pregnant and postpartum athletes) — along with clinical commentary from the Institute of Clinical Excellence (ICE) Pelvic Division. Full study citations are available on request.

A quick note: This article is meant to be educational, not a substitute for medical advice. Every pregnancy is different, so please check with your OB, midwife, or a pelvic health physical therapist before starting or changing an exercise routine — especially if you have any pregnancy complications or health conditions. If you'd like guidance specific to you, we're always happy to help at Rally Physical Therapy.