Birth Ball Exercises in Pregnancy: Form, Reps and Common Mistakes

This guide to birth ball exercises in pregnancy is for UK mums-to-be who want gentle, evidence-led ways to stay comfortable, ease aches and prepare for labour. It walks you through choosing and inflating the right ball, seven simple moves with clear form and reps, what to adapt by trimester, and the common mistakes to avoid. Everything here is general information, so always check with your midwife or clinician before you start.

TL;DR

• A birth ball is simply a large anti-burst gym ball (often 65-75cm) used for gentle sitting, rocking and mobility work in pregnancy.
• Most people need a 65cm ball; if you are taller than about 5'7" (170cm), a 75cm ball usually suits better. Your hips should sit level with or slightly above your knees.
• Seven beginner-friendly moves: seated bounce, hip circles, pelvic tilts, figure-of-eight, supported squats, seated side stretch, and a calm rest-and-breathe position.
• Keep it gentle. Use the talk test, stay hydrated, and stop if you feel dizzy, get pain, or notice any bleeding or leaking fluid.
• Always get the all-clear from your midwife or GP first, especially with a high-risk pregnancy or any complications.
• An anti-burst ball matters: it deflates slowly rather than popping if punctured, which is the safer choice when you are pregnant.

Why a birth ball helps during pregnancy

A birth ball (also called a gym ball, swiss ball or exercise ball) gives you a soft, mobile surface to sit on. Because it moves with you, it encourages an upright posture, takes pressure off your lower back, and lets your hips open and rock in a way a firm chair cannot. Many people find sitting on one more comfortable than a sofa in the later weeks.

Staying gently active is good for most pregnancies. The NHS notes that keeping up regular activity strengthens your muscles, eases backache and helps you cope with labour, and that you should be able to hold a conversation while you move. The pregnancy charity Tommy's recommends building up to around 150 minutes of activity a week, slowing down if talking leaves you breathless. Birth ball work fits neatly into that picture as low-impact, joint-friendly movement.

The ball also has a role later on. During early labour, the NHS suggests staying upright and gently active to help your baby move down into the pelvis, and a ball is one comfortable way to do that. Practising now means it feels familiar later.

Who these birth ball exercises in pregnancy are for

This routine suits anyone with a straightforward, low-risk pregnancy who has been cleared to exercise. It is gentle enough for beginners and for people returning to movement after a quiet first trimester. If you have a high-risk pregnancy, placenta praevia, a history of preterm labour, pre-eclampsia, or any bleeding or pain, do not start until you have spoken to your midwife or obstetrician. The Pelvic, Obstetric and Gynaecological Physiotherapy network (POGP) is a useful place to find a specialist physio if you want tailored guidance.

Choosing and inflating your birth ball

Getting the size and firmness right makes a real difference to comfort and stability.

• Size: a 65cm ball suits most people up to around 5'7" (170cm). Taller mums-to-be usually prefer 75cm. The simple test: when you sit on it, your hips should be level with or just above your knees, with both feet flat on the floor.
• Firmness: inflate so it has a little give when you press it, not rock hard. A slightly softer ball is more stable and forgiving in pregnancy. Re-check the firmness every few weeks, as balls lose a little air over time.
• Anti-burst is non-negotiable: choose a ball rated anti-burst, which slowly deflates rather than bursting if it is punctured. That gradual deflation is far safer when you are carrying a bump.
• Surface: use the ball on a non-slip floor or a yoga mat, away from sharp edges and furniture you could knock into.

The kit we use: flexa.fit Anti-Burst Gym Ball

For these exercises we use the flexa.fit Anti-Burst Gym Ball (Pump Included). It is anti-burst rated, comes in 65cm and 75cm options so you can match your height, and ships with a pump so you can set the firmness right out of the box. Prices start at £9.99, with free UK delivery and no minimum spend, and you can use code MEGLIO10 on full-price singles.

Shop the Gym Ball

If you are weighing up whether your existing kit will do, our guide on whether you can use a pilates ball as a birth ball explains why the small soft pilates ball and the large birth ball are not interchangeable.

Seven gentle birth ball exercises in pregnancy

Do these in bare feet or grippy socks on a stable floor. Warm up with a minute or two of easy sitting and bouncing first. Move slowly, breathe normally, and keep a chair, wall or partner nearby for support until you feel steady. If a move does not feel right, leave it out.

1. Seated bounce

Sit tall in the centre of the ball, feet flat and hip-width apart, hands resting on your thighs or the ball. Gently bounce by springing through your heels, keeping your back long and your shoulders relaxed. This wakes up your pelvic floor and gets blood moving.

Reps: 1-2 minutes of easy bouncing. Stop if you feel any pressure or discomfort.

2. Hip circles

Sitting tall, draw slow circles with your hips, as if stirring a pot. Keep your upper body still and let the movement come from your pelvis. Do one direction, then reverse.

Reps: 8-10 circles each way, 1-2 rounds. This is one of the most soothing birth ball exercises in pregnancy for a tight lower back.

3. Pelvic tilts

Sit tall and gently rock your pelvis forwards and backwards, flattening and arching your lower back in a small, controlled range. Exhale as you tuck the tailbone under. These help ease back ache and keep the lower spine mobile.

Reps: 10-12 slow tilts, 1-2 sets.

4. Figure-of-eight

Trace a slow figure-of-eight with your hips, shifting weight smoothly from one sit bone to the other. Keep it small and comfortable. This opens the hips and encourages relaxed movement through the pelvis.

Reps: 6-8 figure-of-eights, 1-2 rounds.

5. Supported squats

Place the ball between your lower back and a wall, feet a little in front of you and hip-width apart. Slowly bend your knees to roll down into a gentle, shallow squat, then press back up. The ball supports your back and controls the depth. Only go as low as feels easy, and never into pain.

Reps: 6-8 slow squats, 1-2 sets. Skip this if your pelvis feels unstable or painful, and ask a physio about pelvic girdle pain.

6. Seated side stretch

Sitting tall, rest one hand on the ball or your thigh and reach the other arm up and gently over to the side, feeling a soft stretch along your ribs and waist. Breathe into the stretch, then switch sides.

Reps: hold each side for 2-3 breaths, 2-3 times per side.

7. Rest and breathe (leaning forward)

Kneel on a mat and drape your upper body forwards over the ball, arms and chest resting on it, head supported. Rock very gently and take slow, calm breaths. This takes weight off your back and pelvis and is a lovely position to practise for early labour.

Reps: rest here for 1-3 minutes whenever you need to unwind.

For ideas on building these into a wider home routine once baby arrives, our resistance band home workout is a gentle next step, and our exercise ball for pilates guide covers using the same ball beyond pregnancy.

Trimester guidance

Your body changes a lot across pregnancy, so adapt as you go.

• First trimester: if you feel well and have been cleared to exercise, gentle sitting, bouncing and pelvic tilts are usually fine. Many people simply use the ball as a comfy seat while energy is low. Stay hydrated and do not overheat.
• Second trimester: often the most comfortable stretch. This is a good time for the full routine, keeping support nearby for balance as your bump grows and your centre of gravity shifts.
• Third trimester: focus on comfort, hip mobility and the lean-forward rest position. Avoid anything that feels unstable, and take extra care getting on and off the ball. The seated bounce and forward rest are great for the run-up to labour.

Across all trimesters, avoid lying flat on your back for long periods from the second trimester onwards, and skip any move that involves a fall risk or pressing on your bump.

Common mistakes to avoid

• Wrong ball size: a ball that is too small drops your hips below your knees and strains the lower back. Match the size to your height.
• Over-inflating: a rock-hard ball is less stable. Leave a little give.
• Using a non-anti-burst ball: never risk a standard ball that could pop. Anti-burst only.
• Going too hard: this is gentle mobility, not a workout to push through. If you cannot hold a conversation, ease off.
• No support when balance is poor: keep a wall, chair or partner close, especially later on.
• Ignoring warning signs: stop and seek advice if you feel dizzy, short of breath, get pain, contractions, bleeding or any fluid leaking.

FAQs

Are birth ball exercises in pregnancy safe?

For most low-risk pregnancies, gentle birth ball exercises in pregnancy are considered safe and helpful for comfort, posture and mobility. The NHS encourages staying active throughout pregnancy. That said, always get the all-clear from your midwife or GP first, especially if you have any complications, and stop if you feel unwell.

When can I start using a birth ball in pregnancy?

You can start at any stage once your midwife or doctor confirms it is safe for you, though many people begin in the second trimester when energy returns and balance is still good. In the first trimester, simply sitting on the ball is a gentle way to start. Build up slowly and listen to your body.

What size birth ball do I need?

Most people need a 65cm ball, while those taller than about 5'7" (170cm) usually suit a 75cm ball. The quick check is to sit on it: your hips should be level with or slightly above your knees, with both feet flat on the floor. The flexa.fit Anti-Burst Gym Ball comes in both sizes.

How long should I sit or exercise on a birth ball each day?

There is no fixed rule. Many people sit on a birth ball comfortably for 20-30 minutes at a time and do the gentle exercises for 10-15 minutes most days. Use the talk test as your guide, take breaks, and stop if you feel any discomfort, pressure or fatigue.

Can a birth ball help bring on or ease labour?

Gentle bouncing, hip circles and leaning forward over the ball can help you stay upright and mobile, which the NHS suggests can help your baby move down during early labour and may ease the experience. A birth ball will not reliably induce labour. Always follow the advice of your midwife or maternity team.

What is the difference between a birth ball and a pilates ball?

A birth ball is a large air-filled gym ball (typically 65-75cm) you sit and move on. A pilates ball usually means the small soft mini ball (around 18-25cm) used between the knees or hands. They are not interchangeable for pregnancy use. Our guide on whether you can use a pilates ball as a birth ball explains why.

Do I need an anti-burst ball specifically?

Yes. An anti-burst ball deflates slowly rather than bursting if it is punctured, which protects you from a sudden fall while pregnant. It is the only type we would recommend for birth ball exercises in pregnancy. Check the product specification confirms an anti-burst rating before you buy.

Conclusion

A birth ball is one of the simplest, most affordable bits of kit you can have during pregnancy. Used gently, it eases back ache, opens the hips, encourages good posture and gives you a familiar, comforting tool to lean on in early labour. Pick the right size, keep it anti-burst, set a comfortable firmness, and work within the talk test. Most of all, get the green light from your midwife or clinician before you start, and let how you feel guide how much you do.

This article is for informational purposes only and is not medical advice. Consult a qualified healthcare professional, such as your midwife, GP or a women's health physiotherapist, before starting any new exercise programme in pregnancy, especially if you have an existing condition, complication or injury. Stop exercising and seek medical advice if you experience pain, dizziness, breathlessness, bleeding or leaking fluid.