The Case for Staying Active During Pregnancy (And How to Do It Safely)

What the research actually says — and why clinician-guided movement beats generic advice.

Somewhere between "take it easy" and "you can do everything you did before" is the actual answer to exercising during pregnancy. And the actual answer, backed by decades of research, is clear: movement during pregnancy is not only safe for most women — it's beneficial. For you and for your baby.

The key word is guided. Not because pregnancy limits what you can do — it largely doesn't — but because the right program is calibrated to your body, your baseline, and how your pregnancy is progressing. Here's what we tell our prenatal clients at MBODY Physical Therapy and Wellness in Westlake Village.

What the Research Says

Major guidelines from ACOG (American College of Obstetricians and Gynecologists) recommend at least 150 minutes of moderate-intensity exercise per week during an uncomplicated pregnancy. The benefits are well-documented:

• Reduced risk of gestational diabetes and pregnancy-induced hypertension

• Lower rates of excessive gestational weight gain

• Improved mood and reduced risk of prenatal depression and anxiety

• Shorter labor and lower rates of C-section in some studies

• Better fetal outcomes including healthy birth weight

• Maintained strength and cardiovascular capacity for the physical demands of labor and early postpartum life

The research doesn't tell you to rest more. It tells you to keep moving — thoughtfully.

What You Can Do: Most Everything

Let's lead with what the research actually supports, because the list is longer than most people expect.

Crunches and core work: Yes. Abdominal exercises — including crunches — are appropriate during pregnancy when performed with proper technique and guided progression. The goal isn't to avoid core training; it's to train the core in a way that builds pressure management and function rather than just isolating surface muscles. Your core needs to be strong and coordinated to support a growing belly, protect your spine, and prepare for labor. We train it accordingly.

Rotation and twisting movements: Yes. Rotational exercises are safe and functional during pregnancy. Your spine is designed to rotate, and maintaining that mobility and strength through pregnancy supports posture, reduces back pain, and keeps you moving the way your daily life requires. No need to avoid it.

Strength training: Absolutely yes. Lifting weights during pregnancy is not only safe — it's one of the best things you can do. Resistance training maintains muscle mass, supports joint stability as relaxin loosens ligaments, and builds the physical reserve you'll need for labor and the postpartum period. Squats, deadlifts, pressing movements, rows — all of it is on the table with appropriate load management.

Cardio: Yes. Running, cycling, swimming, rowing — continue what you were doing with natural modifications as your body changes. Your cardiovascular system is working harder during pregnancy; maintaining aerobic fitness supports it.

The bottom line: pregnancy is not a reason to stop training. It's a reason to train with someone who knows what they're doing.

What Changes as Pregnancy Progresses

The program evolves — not because movements become unsafe, but because your body is changing and the smart approach adapts with it.

First trimester: Fatigue and nausea may limit what feels possible. When energy is available, most of your existing routine is appropriate. Staying hydrated and avoiding overheating are the main practical considerations.

Second trimester: Usually the most comfortable training window. Core work, strength training, and cardio all continue with intelligent progression. As the uterus grows, we shift some loading positions and continue building pressure management — how you breathe and brace through movement — to support the changes in your body.

Third trimester: Volume and intensity naturally adjust as comfort and energy shift. The movements don't disappear — the loads and positions evolve. Walking, swimming, modified strength work, and core training all remain excellent. Balance adaptations become part of the conversation as your center of gravity continues to shift.

Why Clinician-Led Programming Is Different

It's not that a YouTube prenatal yoga class is wrong. It's that it can't see you. It can't assess how you're moving, adjust when something isn't working, progress you intelligently when you're ready for more, or identify early signs of pelvic girdle pain before they become a bigger issue.

Working with a physical therapist or a PT-guided fitness program during pregnancy means your exercise is calibrated to your body — not built for a hypothetical pregnant person. And it means the clinician guiding your training knows your history, your goals, and what your body is actually doing.

The MBODY Prepare Cohort

Our Prepare program is built specifically for this. It's a prenatal fitness cohort developed and overseen by our physical therapy team — which means crunches, rotation, strength training, and real progressive programming are all part of the plan, not things to tiptoe around.

Prepare mamas train together, progress together, and arrive at delivery stronger and better prepared than if they'd spent nine months being told what not to do. Babies who arrive early get to join the postpartum programming side of the house.

If you're in Westlake Village, Thousand Oaks, Calabasas, or the broader Conejo Valley and looking for a prenatal program that actually treats you like an athlete who happens to be pregnant — Prepare is built for you.

→ Ask about the Prepare prenatal cohort at MBODY Westlake Village. mbodyptandwellness.com