Is weightlifting safe during pregnancy?
Strength training and weightlifting are safe during pregnancy for women who were already training regularly before they became pregnant. With appropriate modifications, resistance training can be continued throughout all three trimesters and offers real benefits: it helps maintain muscle strength, supports posture and back health, reduces joint pain, and prepares the body for the physical demands of labour and early parenthood.
If you were not lifting weights before pregnancy, starting a resistance programme from scratch is not recommended. Bodyweight exercises, walking, swimming, or pregnancy Pilates are better starting points.
If in doubt about your specific circumstances, speak to your midwife or GP before continuing or modifying your training programme.
Benefits of strength training during pregnancy
- Back pain prevention. Strong glutes, back extensors, and deep core muscles support the increasing load on the lumbar spine as the bump grows.
- Posture. Pregnancy shifts posture forward; strong posterior chain muscles counteract this.
- Reduced gestational diabetes risk. Muscle tissue increases insulin sensitivity; regular strength training is associated with lower rates of gestational diabetes.
- Labour preparation. Strength in the legs, hips, and upper body helps manage the physical demands of active labour.
- Postnatal recovery. Maintaining strength during pregnancy supports faster return to activity after birth.
Key modifications
Avoid the Valsalva manoeuvre
The Valsalva manoeuvre — taking a deep breath, holding it, and bearing down under a heavy load — is a technique used by powerlifters to create intra-abdominal pressure. During pregnancy, this sharply increases pressure on the abdomen and pelvic floor and should be avoided. Instead, breathe continuously throughout every lift: exhale on the exertion and inhale on the return. If you cannot breathe continuously through a lift, the weight is too heavy.
Reduce load
Your maximum working weights should come down during pregnancy. Training to muscular failure or near-maximum effort is not appropriate. A general guide is to train at around 60–70% of your pre-pregnancy working weight, focusing on controlled movement and continuous breathing. Your goal during pregnancy is to maintain strength and function, not to make gains.
Avoid lying flat on your back after the first trimester
From around 16–20 weeks, avoid exercises performed lying flat on the back (supine). The weight of the uterus can compress the vena cava in this position, reducing blood return to the heart. Exercises like bench press, floor press, and supine dumbbell work should be modified to an incline, or replaced with standing or seated alternatives. A 30–45 degree incline bench removes most of the vena cava compression risk while still allowing pressing movements.
Modify core work
Traditional crunches, sit-ups, and direct rectus abdominis exercises should be stopped. These exercises create a ‘coning’ or ‘doming’ effect at the midline as the uterus grows and can worsen diastasis recti (separation of the abdominal muscles). Replace them with deep core activation work — exercises that engage the transverse abdominis (drawing the navel gently toward the spine) — such as bird-dog, dead bug (modified for pregnancy), and pallof press.
Pelvic floor awareness
As with running, any leaking of urine during exercises involving impact or heavy load is a sign that the pelvic floor needs support. Leaking during squats, cleans, or overhead work warrants a visit to a women’s health physiotherapist.
Exercises to modify or avoid
| Exercise | Guidance |
|---|---|
| Heavy barbell squats | Reduce load; goblet squat is a good alternative |
| Deadlifts | Continue with significant load reduction; avoid if causing lower back pain |
| Bench press | Move to incline bench from second trimester |
| Overhead press | Generally fine; seated may feel more stable later on |
| Barbell back squat | High bar position becomes increasingly awkward; front squat or goblet squat preferred |
| Power cleans / Olympic lifts | Avoid in second and third trimester — bar path crosses the bump and technique suffers |
| Heavy loaded carries | Reduce load; single-side carries can aggravate pelvic girdle pain |
| Crunches / sit-ups | Avoid from first trimester onwards |
Good exercises throughout pregnancy
- Goblet squat
- Romanian deadlift (with reduced load)
- Seated dumbbell press
- Dumbbell rows (single arm, braced on bench)
- Cable pull-downs and rows
- Glute bridges and hip thrusts (lying flat caution applies — use an elevated surface)
- Banded glute work (clamshells, side steps)
- Pallof press
- Incline dumbbell press
When to stop and seek advice
Stop training and contact your midwife if you experience:
- Chest pain, palpitations, or unusual shortness of breath
- Dizziness or light-headedness
- Any sharp or persistent abdominal or pelvic pain
- Vaginal bleeding or fluid leakage
- Uterine contractions during or after training
- Leaking of urine during exercise (seek a physiotherapy assessment)
- Significant swelling, particularly in the face, hands, or feet