May 14, 2025

1 key to safe Prenatal workouts

Lessons from a Fit life.

Is heart rate monitoring the key to safe prenatal workouts?

There are so many things to think about when one becomes pregnant. Should I workout is probably pretty low on that list. However, when you consider that Prenatal workouts may prevent gestational diabetes, relieve stress, and build more stamina needed for labor and delivery, suddenly safe prenatal workouts become a priority.

Let’s start with the basic question: should you work out during pregnancy.

Short answer: yes.

But… Train intelligently.

The Goal is safety in the prenatal work out

We want a healthy Mom and Baby. Not new personal records.

If you work out avidly before pregnancy then by all means continue to do so. But keep in mind this isn’t the time to push to the next level.

If you weren’t working out before pregnancy it’s safe to begin a workout program. Consult with your Doc and don’t do anything too strenuous.

So how does one know how hard to push. We can rely on rate of perceived exertion, but that is very subjective. How many people can accurately gauge how hard their body is working. Wouldn’t it be great if we had a built in dashboard illustrating how hard we’re going?

Actually.. we kind of do have that dashboard.

Keep your Heart Rate under 140 BPMS

“Heart rate, as a physiological marker, mirrors the body’s internal reactions to the rigors of physical exertion.”

The intensity of your workout should be less than 60%-80% of your age-predicted maximum maternal heart rate, which is usually no more than 140 beats per minute, according to the American College of Obstetrics and Gynecology.

How did we get to that number?

It’s widely accepted that 220 minus your age = your predicted max heart rate.

So 140 comes in at a little above the middle of that spectrum.

Ensure safe Prenatal workouts

So grab yourself a heart rate monitor. You can hook them up to your phone or your smart watch.

We should note that heart rate monitoring isn’t a foolproof way to track effort. “Numerous physiological variables that can introduce inaccuracies and mislead athletes.”

Think of all those benefits for you and your kiddo; not to mention how much easier it will be to resume workouts post pregnancy.

This baby is a product of safe prenatal workouts.

Related: Boston's Best Female Trainers: Megan Beck · Healthspan: Quality of Life Workouts

About the author

Stephen Allison

Stephen Allison founded Fit, a private personal training studio in Boston’s South End, after more than 20 years of coaching clients one-on-one. He trains runners, lifters and everyday athletes.

Want a coach in your corner? Train one-on-one with Stephen or another Fit trainer. Your first 45-minute session is free.

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