Prenatal · 9 min read
Third trimester strength training: what to keep, what to drop
Third trimester is where most pregnant moms get told to stop lifting. They shouldn't. Here's exactly what to modify, what to keep, and what to drop entirely.
By Lexi Krieger · NASM-CPT, Pre/Postnatal Performance Specialist · May 23, 2026
Third trimester is where most pregnant moms get told to stop lifting. They shouldn't — assuming OB clearance and the right modifications. The third trimester body is doing more biological work than at any other time in life, and strength training during this window has measurable benefits for labor outcomes + postpartum recovery.
Here's exactly what stays, what changes, and what comes out of the program after week 28.
What changes in the third trimester body
- Center of gravity shifts forward — anterior pelvic tilt accelerates, balance gets less reliable, especially in single-leg work.
- Relaxin peaks — joints are at their loosest. Pelvic girdle pain risk goes up.
- Diaphragm is compressed — breath capacity drops; you'll fatigue faster.
- Diastasis recti is forming — the linea alba is at its most stretched; the wrong exercises can worsen the gap.
- Heart rate is elevated at baseline — even gentle effort feels harder.
- Blood pressure can dip when supine — lying on your back after ~20 weeks is officially off the menu.
What to KEEP in your program
1. Goblet squats — narrower stance, lighter load
Squats stay. They prep the body for labor positions. Cue: narrow your stance (no wider than your hips), drop the load to about 50–60% of what felt easy in trimester 2, full breath on the way down + up, no Valsalva. Most clients do 2–3 sets of 6–8.
2. Single-arm rows + presses
Upper-body pulling is critical right now — the third-trimester posture (boobs forward, lower back arched) screams for mid-back strength. Single-arm dumbbell rows (supported with the other hand), single-arm shoulder presses (seated is fine), face pulls with a band. Keep these the whole way.
3. Hip hinges — Romanian deadlifts, kettlebell deadlifts
Posterior chain work stays. The hip hinge pattern is what gets you out of bed without dying for the next 12 weeks. Lighter load, shorter range of motion if the belly gets in the way, but the pattern stays.
4. Loaded carries — suitcase + farmer + offset
My favorite third-trimester move. Full-body, anti-rotation core, zero impact, builds the strength you'll actually use carrying a car seat. Moderate weight, walk 30–60 seconds at a time.
5. Glute med isolation — clamshells, banded walks, single-leg bridges
Glute medius is the muscle that holds your pelvis together when one leg is loaded. In the third trimester, it gets weak fast — and weak glute med = pelvic girdle pain. Daily, low-load, high-rep.
6. Diaphragmatic breath work + pelvic floor coordination
5 minutes a day, every day. This is birth prep. It's also postpartum prep. It's also pelvic floor coordination practice. Non-negotiable.
What to MODIFY
Front squats / barbell back squats → goblet variations
Bar on your front rack compresses your belly. Bar on your back loads your spine in a way that doesn't pair well with relaxin-loose joints. Goblet variations let you keep the squat without either problem.
Bench press / push-ups → incline or wall variants
Flat bench presses are off after ~20 weeks (supine). Push-ups are still fine but at an incline (against a bench, box, or wall) so your belly isn't grazing the floor at the bottom. Same strength signal, no belly compression.
Conventional deadlifts → kettlebell sumo or RDL
Pulling a barbell from the floor when you're 32 weeks pregnant has the form risk of pulling against your bump. Kettlebell sumo deadlifts (bell between the feet, narrow-ish stance) and RDLs (just the eccentric, shorter range) get the hip hinge without the bump fighting the bar.
Standing overhead press → seated half-kneeling
Standing overhead pressing in the third trimester encourages lumbar extension (your back arches under the load). Seated or half-kneeling resets the base of support and lets you press without the arch.
What to DROP entirely
- Supine work (lying on your back) after ~20 weeks — no flat crunches, sit-ups, bench press, etc.
- Prone work (lying face-down) once the bump exists
- Any plank variation that has your belly hanging — modify to wall planks or hands-on-bench inclines
- Single-leg loaded work — Bulgarian split squats, pistols, single-leg deadlifts. Stability cost is too high.
- Conventional barbell deadlifts off the floor — too much bump-bar conflict
- Hot yoga / hot pilates / sauna training
- Real one-rep-max attempts — intra-abdominal pressure spike isn't worth it now
- HIIT with sprint-style intervals — keep work-to-rest balanced, lower the intensity
- Wide-stance squats and lunges (encourages pelvic spread → PGP risk)
What's actually happening when you train at 36 weeks
Sessions get shorter and slower. That's a feature, not a problem. A 30-min third-trimester session that ends with you feeling capable is worth a hundred missed workouts because "I'm too pregnant." The goal is consistent training, not heroic training.
Most of my third-trimester clients do 2–3 sessions a week, 30–40 minutes each, focused on the keepers above. By week 38 they're walking into labor like athletes who happen to be 9 months pregnant.
Sample third-trimester week
- Day 1: Lower body — goblet squats, KB sumo deadlifts, glute bridges, clamshells. 30–35 min.
- Day 2: 30-min walk + 5 min breath/pelvic floor work.
- Day 3: Upper body — single-arm rows, half-kneeling presses, face pulls, suitcase carries. 30–35 min.
- Day 4: Rest or gentle yoga/swimming.
- Day 5: Full-body lite — goblet squats, RDLs, dumbbell rows, farmer carries. 30 min.
- Day 6: Mobility + walking. 30–45 min easy.
- Day 7: Rest.
When to listen to the body and skip
- Cramping that lingers after a movement
- Pelvic pressure that feels like the baby is dropping
- Round ligament pain that sharply locks you up
- Any bleeding or leaking fluid
- Headaches you can't shake
- Persistent contractions (vs Braxton Hicks that pass)
Birth-prep work the last 4 weeks
Around week 36 I shift the focus to positions and patterns you'll actually use in labor: deep squat holds (supported), cat-cow, supported pigeon stretches, breath sequences for active labor, and pelvic tilts. Less strength volume, more birth-specific work.
If you're in the Lehigh Valley
Third-trimester clients across Saucon Valley, Center Valley, Lower Saucon Township, and Lower Macungie come to me at home for the entire window — most stop driving anywhere by week 34 anyway. NASM Pre/Postnatal Performance Specialist. Equipment included.
FAQs
How late in pregnancy can I train?
Most uncomplicated clients train until 38–40 weeks. Some go right into labor week. The deciding factor is how the body feels and what your OB says, not the week number.
What about Braxton Hicks during a session?
Stop, hydrate, sit down. Almost always passes. If they're patterned and don't pass, call your OB. Not exercise-caused, but a signal to stop training and rest.
Should I drop weight every week now?
Not necessarily every week. But monitor: if a load that felt fine last week feels heavy this week, listen to that signal. Trimester 3 progresses fast; loads usually come down 10–20% across the trimester.
Will training help with labor?
Research consistently shows shorter pushing phases, lower rates of intervention, and faster postpartum recovery in pregnant women who trained through pregnancy. Anecdotally — almost every client I've worked with through delivery has reported the same.
