Pregnancy is an extraordinary journey that benefits from thoughtful, intentional movement. As a certified personal trainer and prenatal exercise specialist, I’m often asked, “When should I start modifying my workouts during pregnancy?” There isn’t a single answer that fits everyone, but there are clear signs and stages when adjusting your routine becomes important for your safety and your baby’s well-being.
I cover exercise modifications, pregnancy nutrition, and more in depth in my GOOD // SWEAT Pregnancy Guide, which offers a 26-week program specifically designed to guide you through the second and third trimesters. Below is a practical overview to help you feel confident exercising safely through pregnancy.
Support for Every Trimester
My aim is to provide guidance that brings peace of mind so you can feel confident moving safely at any stage of pregnancy. Always trust your instincts, listen to your body, and consult your healthcare provider when needed. Working with a physical therapist, pelvic floor therapist, or prenatal fitness specialist can also help tailor exercises to your unique needs.
Understanding Your Body’s Changes
Even in the first trimester, hormonal shifts can affect joint stability, and increased fatigue or nausea can change how your body responds to activity. Exercise safety during pregnancy is highly individual and depends on your pre-pregnancy fitness level, which trimester you’re in, and how you feel during workouts.
It’s essential to listen to your body and to know how to adjust your routine using professional, evidence-based guidance.
When to Modify Workouts During Pregnancy
You should start modifying workouts as soon as your body or healthcare provider signals a need—or ideally, make proactive adjustments. Examples of when to change your routine include:
- First trimester: scale back intensity and avoid overheating. Choose breathable clothing and avoid hot, humid conditions.
- Second trimester: reduce or avoid exercises performed lying flat on your back and incorporate more core-safe movements.
- Third trimester: prioritize mobility, maintain strength with pregnancy-safe progressions, and use pelvic floor–friendly exercises.
The main takeaway: always modify for comfort. Adjust intensity, range of motion, and duration to match your energy and comfort levels throughout pregnancy.
What Modifications Might Include
Pregnancy varies week to week. Many people experience a difficult first trimester and don’t regain energy until around week 13. Whether you’re dealing with nausea, low energy, or sore muscles, it’s normal—and the goal is to stay active at a pace that feels right. Don’t hesitate to change your plan as needed.
Common pregnancy workout modifications include:
- Switching from high-impact to low-impact activities such as brisk walking, swimming, or prenatal yoga.
- Reducing workout intensity or volume to support energy levels and recovery.
- Adding core and pelvic floor support exercises that focus on stability rather than strain.
- Avoiding movements that feel unstable or cause abdominal coning. Replace them with core-safe options like pelvic tilts, side-lying leg lifts, or bird-dogs that engage the core without excessive pressure.
These adjustments support safe, effective workouts that maintain strength and stamina while protecting recovery. If you experience discomfort, pain, dizziness, or shortness of breath, stop, rest, and modify or seek medical guidance. Staying hydrated and pacing yourself are always important.
Ready to Move Safely Through Pregnancy?
Having a clear, structured fitness plan during pregnancy can make a big difference. If you want a trimester-by-trimester pregnancy workout program starting at week 13, I created the GOOD // SWEAT Pregnancy Guide to remove guesswork and help you move confidently throughout pregnancy.
Related Pregnancy Fitness Blog Posts for Every Stage:
Prenatal Fitness: Exercises To Avoid While Pregnant
The 5 Stretches You Should Do Daily For Pregnancy
20-Minute Dumbbell-Only Workout (Pregnancy Friendly)
9 Reasons Why Strength Training Is Beneficial During Pregnancy
My Postpartum Fitness Routine