“Pregnant Women Shouldn’t Train Hard” is BS. New study breakdown! | Educational Video | Biolayne

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For decades, pregnant women have been told to “take it easy,” lift light, or avoid resistance training altogether — often out of fear rather than evidence.
A new controlled study examined high-intensity resistance exercise during pregnancy, including squats, bench press, and deadlifts performed at 70–90% of a 10-RM, with and without the Valsalva maneuver. Researchers assessed key markers of fetal well-being, including fetal heart rate and umbilical blood flow.
The result?
No clinically meaningful disturbances in fetal heart rate.
No adverse changes in umbilical blood flow.
These findings align with a large body of existing research showing that maternal resistance training does not compromise fetal health in uncomplicated pregnancies — and may actually support better pregnancy outcomes when appropriately programmed.
Systematic reviews and professional guidelines consistently report that prenatal exercise, including resistance training, is associated with:
• Normal fetal heart rate responses
• No increased risk of adverse birth outcomes
• Improved maternal health and function
The real takeaway: Intensity alone is not the enemy. In healthy pregnancies, properly supervised resistance training — even at relatively high effort — appears safe and beneficial on average.
Fear-based rules don’t protect moms or babies.
Evidence-based guidance does.
References (human data & guidelines):
• Davenport MH et al. Impact of prenatal exercise on fetal heart rate responses. Br J Sports Med. 2019.
• Mottola MF et al. 2019 Canadian guideline for physical activity throughout pregnancy. Br J Sports Med.
• ACOG Committee Opinion No. 804. Physical Activity and Exercise During Pregnancy and the Postpartum Period. 2020.
• Recent controlled trial: Maximal and fetal responses to high-intensity resistance exercise during pregnancy (2024).
That said, listen to your OBGYN & if you have complications these guidelines may change
Train smart. Train informed. And stop underestimating pregnant women.

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