Safe Exercise During Pregnancy, A Trimester-by-Trimester Guide

The strongest predictor of an easier recovery isn't luck. It's how active you stay through pregnancy in a way that protects your core, pelvic floor and joints.

First trimester (weeks 1 to 13)

Do: everything you were doing before pregnancy, at a slightly lower intensity. Walking, swimming, cycling, yoga, strength training all stay in.

Modify:

• Reduce heavy loads by roughly 20%. Focus on form and full-range control.
• Stop competitive sports with fall risk.
• If you were not previously active, start with 20 minutes of walking daily.

Skip:

• Contact sports, downhill skiing, scuba diving
• Hot yoga and hot Pilates (core body temperature spikes are risky in weeks 4 to 10)

Second trimester (weeks 14 to 27)

The belly is now visible, ligaments are looser, and balance shifts.

Do:

• Prenatal Pilates or physio-led strength 2 to 3 times a week
• Walking or swimming 3 to 5 times a week
• Squats, lunges, seated rows, chest press, deadlifts to knee height

Modify:

• Move flat-on-back exercises to an incline or side-lying after week 20 (the uterus can compress the vena cava)
• Reduce single-leg balance work if you feel unsteady
• Swap planks for side plank on the knees, or bird-dog on hands and knees

Skip:

• Sit-ups, crunches, Russian twists, V-ups, full planks
• Heavy overhead pressing
• Running if you experience pelvic heaviness, leaking or pain

Third trimester (weeks 28 to 40)

Focus shifts from strength gain to maintenance and birth preparation.

Do:

• Daily walking, 20 to 40 minutes
• Pelvic mobility (cat-cow, deep supported squats, pelvic tilts on a birth ball)
• Upper-body strength (rows, chest press) to support carrying baby later
• Perineal massage from week 34 (reduces tearing risk)

Modify:

• Cut cardio intensity so you can still hold a full conversation
• Sit on a birth ball for feeds and desk work to open the pelvis

Skip:

• Any exercise that causes doming of the belly (a visible ridge popping outward)
• Long flat-on-back positions
• Jumping, running with impact if leaking or heaviness appears

Red flags, stop and call your doctor

• Vaginal bleeding, fluid leaking or contractions
• Dizziness, chest pain, shortness of breath out of proportion to effort
• Sudden calf swelling or pain
• Reduced foetal movement after exercise

The physio rule of thumb

If a movement causes doming, pain, leaking or heaviness, it isn't safe today. Regress the exercise, don't push through. A stronger pregnancy is one where you finish every session feeling better than you started.