Should You Lift Heavy During Pregnancy?

The Rules You’ve Been Given

The moment you announce a pregnancy, the restrictions start. Don’t lift more than 25 pounds. Don’t do crunches. Don’t twist. Don’t run. Don’t raise your heart rate above 140. Don’t lie on your back. Don’t, don’t, don’t.

If you are an active woman — a runner, a lifter, a CrossFitter — this list can feel like a prison sentence. Nine months of walking and prenatal yoga when your body is used to deadlifts and intervals.

But here is what most of these rules have in common: they are not based on evidence. They are based on tradition, liability concerns, and a general cultural belief that pregnant women are fragile.

What the Evidence Actually Says

Dr. Danaya says this plainly in her practice: there is no evidence that pregnant women must avoid heavy lifting, rotation, or crunches.

That statement might make you uncomfortable. It goes against everything you have been told. But the research is clear:

• Studies have not shown that resistance training during pregnancy increases risk of miscarriage, preterm birth, or low birth weight
• The old “keep your heart rate under 140” guideline was retired by ACOG decades ago because it was arbitrary and not supported by data
• There is no evidence that abdominal exercises, including crunches, are harmful during pregnancy. A 2024 randomized controlled trial specifically found that abdominal and pelvic floor exercises during pregnancy do not increase diastasis recti
• Rotational movements have not been shown to cause uterine torsion or harm to the baby
• Research shows that abdominal muscle strength is linked to the duration of the second stage of labor—stronger abs may mean a more efficient pushing phase

What the evidence does show is that women who maintain physical activity during pregnancy have better outcomes — lower rates of gestational diabetes, lower rates of preeclampsia, shorter labor duration, and faster postpartum recovery.

Where the “Don’t Lift Heavy” Rule Came From

The 25-pound rule (or 30-pound rule, depending on who told you) is a workplace safety recommendation — it was designed for occupational settings where women were doing repetitive heavy lifting for hours. It was never intended as a fitness guideline for a woman doing a controlled set of deadlifts in a gym.

But it migrated from workplace safety into obstetric advice without anyone questioning the context. An OB who sees hundreds of patients a week does not have time to assess each woman’s exercise history and give individualized guidance. A blanket rule is easier. “Don’t lift more than 25 pounds” is simple, conservative, and feels safe.

It also has no basis in the research for healthy, uncomplicated pregnancies. A woman who was squatting 185 pounds before pregnancy does not need the same advice as someone who has never touched a barbell.

What Dr. Danaya Learned From 4 Pregnancies

Dr. Danaya has been through this four times — each pregnancy different, each recovery different. And what she learned through her own experience confirmed what the research shows.

Her fourth pregnancy was her best recovery. She exercised consistently through the entire pregnancy — including core work and exercises that many programs tell you to avoid. She wore a pelvic support belt when she needed it, listened to her body, and modified based on symptoms, not arbitrary rules.

The result? She returned to the gym at six weeks postpartum, essentially symptom-free.

Compare that to her third pregnancy, when leaking symptoms in the third trimester forced her to stop her volleyball league. Same body, different circumstances, different approach, different outcome.

The lesson is not that every woman should exercise exactly like Dr. Danaya did. The lesson is that blanket restrictions do not account for individual differences — and that staying active, with appropriate modifications, often leads to better outcomes than stopping everything.

The Real Question: What Should You Watch For?

Instead of following a list of prohibited exercises, a better approach is symptom-based modification. This means you keep doing what you were doing before pregnancy, but you pay attention to specific signals from your body:

• Pelvic pressure or heaviness: Feeling of downward pressure in the pelvis during or after exercise. This may mean you need to reduce load, change positions, or add a pelvic support strategy
• Leaking: Urine loss during exercise is a sign your pelvic floor is not managing the current demand. Modify the movement — don’t abandon exercise entirely
• Pain: Pelvic pain, back pain, round ligament pain that is worsened by specific exercises. Address the pain, not the category of exercise
• Doming or coning: Visible ridge along the midline during ab exercises. Modify intensity or position
• Shortness of breath or dizziness: Reduce intensity and allow more recovery between sets

If none of these symptoms are present, the exercise is likely fine for your body right now. If symptoms appear, modify the specific movement — do not stop exercising.

What About Lying on Your Back?

The “don’t lie on your back after the first trimester” advice is another example of good intention without strong evidence. The concern is that the weight of the uterus compresses the vena cava (the large vein returning blood to the heart), reducing blood flow.

In reality, most women will feel lightheaded or uncomfortable before any significant compression occurs — your body gives you signals. If lying flat on your back feels fine, a few minutes of bench press or floor exercises is not going to harm your baby. If it feels uncomfortable, prop up with a wedge or switch to an inclined position.

Symptom-based, not rule-based.

Why Active Pregnancies Lead to Better Recoveries

Here is what often gets lost in the fear: exercise during pregnancy is protective.

Women who maintain strength training during pregnancy tend to:

• Have shorter labor durations
• Need fewer interventions during delivery
• Recover faster postpartum
• Have lower rates of postpartum depression
• Return to activity sooner with fewer complications

Your muscles, your cardiovascular system, and your pelvic floor all benefit from continued loading during pregnancy. Stopping everything and waiting nine months creates a baseline of deconditioning that makes postpartum recovery harder, not easier.

When You Actually Should Stop or Modify

To be clear: there are real medical reasons to restrict exercise during pregnancy. Placenta previa, cervical insufficiency, preeclampsia, premature rupture of membranes, and certain high-risk conditions all require modified activity levels as directed by your OB or midwife.

This article is about healthy, uncomplicated pregnancies — which is the majority. If your provider has placed you on activity restrictions for a specific medical reason, follow their guidance.

But if your provider’s only reason is “be careful” or “don’t lift more than 25 pounds” without a specific medical indication — it is worth having a deeper conversation or seeking guidance from a provider who understands both pregnancy and exercise.

How Pelvic Floor PT Helps During Pregnancy

A prenatal pelvic floor assessment is one of the best things an active pregnant woman can do. Not because something is wrong — but because it gives you data.

Dr. Danaya assesses:

• How your pelvic floor is functioning under the changing load of pregnancy
• Whether your core and pelvic floor are coordinating properly during lifts and impact
• Your breathing and pressure management strategies
• Any early signs of prolapse or incontinence that can be addressed now rather than postpartum

This is not about telling you what you cannot do. It is about giving you confidence in what you can do — with real data instead of generic rules.

The Bottom Line

Pregnancy is not a disability. Your body is not made of glass. And blanket exercise restrictions are not evidence-based — they are cultural.

If you were active before pregnancy, you can almost certainly stay active during pregnancy. Modify based on what your body tells you, not based on a list of forbidden exercises that was never grounded in research.

The strongest, safest pregnancies and the best postpartum recoveries come from women who keep moving — thoughtfully, progressively, and with support from providers who understand both exercise and pregnancy.