The Big 3 exercises for lower back pain are the modified curl-up, side plank, and bird dog. Spine researcher Professor Stuart McGill created this group to build trunk endurance without needless movement in the lower back. Each exercise trains your muscles to hold the spine steady against a different force.
The Big 3 are often called core exercises, but that name can be misleading. They aren’t a tough ab workout or a test of grit. Their main role is to teach your trunk to resist motion while your hips, shoulders, and limbs move. Everyday tasks may then feel safer and more controlled.
Good form matters more than long holds or lots of reps. Stop if an exercise causes sharp pain, spreading pain, new numbness, or weakness. Get urgent medical care if back pain comes with loss of bladder or bowel control, numbness around the groin, major leg weakness, fever, or pain after a serious fall.
Why were these movements chosen?
Your lower back often hurts when the load placed on it is more than its tissues can handle right now. The cause may involve a joint, disc, ligament, muscle, or several tissues at once. Poor sleep, stress, a sudden jump in training, and long spells in one position can also change how pain feels.
The lumbar vertebrae need some movement. They shouldn’t be locked in place all day. But repeated bending, twisting, or arching can bother a sensitive back. The Big 3 offer a low-load way to practise control without moving the painful area through a large range.
Each movement handles a different demand. The modified curl-up stops the lower back from being pulled into extension. The side plank fights sideways bending. The bird dog fights rotation as opposite limbs move. Together, they teach the trunk to stay firm while the rest of the body works around it.
Many exercise guides miss a key point: these drills train endurance before peak strength. Most people don’t struggle in daily life because they can’t produce one huge effort. Their position starts to slip when the supporting muscles get tired. Short, tidy holds build useful control without turning the workout into a strain contest.
How do you perform the modified curl-up?
Lie on your back with one knee bent and the other leg straight. Put your hands under the natural hollow in your lower back. They’re a guide, so don’t press your spine flat against the floor.
- Gently tighten your trunk as if you expect a light tap to the stomach.
- Keep your neck in line with your upper body.
- Lift your head and shoulders only a small distance from the floor.
- Hold for about 8 to 10 seconds while breathing normally.
- Lower with control, rest briefly, and repeat.
The lift should come from your upper trunk. Your lower back should keep its natural shape. If your lumbar spine rounds, your chin juts forward, or you rise until you’re sitting up, the move has become a standard curl-up.
Gently pressing your tongue against the roof of your mouth may help keep your neck steady. Look toward the ceiling instead of pulling your chin hard into your chest. Your hands should feel little change in pressure beneath the lower back.
If lifting your shoulders hurts, begin with a light brace and leave your head down. Hold for five seconds, relax fully, then check how you feel. A smaller, pain-free version is far more useful than forcing the full move.
How should you set up the side plank?
The side plank works the muscles running along the side of your trunk. They help stop your pelvis and rib cage from dropping sideways when you walk, carry a bag, climb stairs, or stand on one leg.
Begin with the easier bent-knee version. Lie on your side, bend your knees, and place your elbow under your shoulder. Stack your shoulders and hips. Lift your hips until your body makes a straight line from your head to your knees.
- Keep the supporting shoulder away from your ear.
- Do not roll the chest toward the floor or ceiling.
- Keep the hips in line with the ribs.
- Breathe behind the brace instead of holding your breath.
Hold for 8 to 10 seconds, then lower before your form slips. Train both sides. One side may feel tougher, but trying to force equal hold times in your first session can bring more soreness than benefit.
Try the full side plank only when the knee version feels firm and calm. For the full version, straighten your legs and hold yourself up through your forearm and feet. Staggered feet create a wider base. Stacked feet make it harder.
A common mistake is making time the goal. A 60-second hold with a drooping waist trains the very position you’re trying to avoid. Several brief holds give you more good-quality work with less shaking and joint strain.
What makes the bird dog effective?
The bird dog teaches your trunk to resist twisting as your arms and legs move. That pattern carries into walking and many gym exercises because force travels between the upper and lower body through the trunk.
Start on your hands and knees. Set your hands under your shoulders and your knees under your hips. Find a comfortable middle position for your spine. Don’t force your lower back flat or allow it to sag.
- Brace the trunk gently.
- Slide one leg back while reaching the opposite arm forward.
- Lift only as high as you can without twisting or arching.
- Hold for 8 to 10 seconds and keep breathing.
- Return slowly, reset, and change sides.
Think long, not high. Send your heel away from your body. Reach your hand toward the wall ahead. This simple cue makes you less likely to arch your back for false height.
For feedback, place a light object across your pelvis. If it tips or slides, shorten your reach. You can also start with one limb at a time. Move one arm and return it, then move one leg. Use opposite limbs once your pelvis stays still.
Many people make the bird dog harder by going too fast. Speed can hide small shifts in the spine. The slow return matters too, since your trunk must control the changing load right back to the floor.
How much should you do at first?
Begin with an amount that leaves your back feeling the same or better the next day. One useful starting point is four or five holds per side for each exercise. Keep each rep to 10 seconds or less, with rest between reps.
If the exercises feel good, try descending sets. You could do five clean reps, rest, then complete a smaller second set. The exact number matters less than keeping each hold sharp. Stop the set when your position slips, your breathing loses control, or pain begins to build.
You don’t need long holds. Tired muscles may lead to shaking, breath holding, and unwanted movement in the spine. Add one more short rep before stretching a hold far beyond 10 seconds.
Practise several days each week instead of trying to fix your back in one hard workout. Your first sessions may last less than 10 minutes. That’s enough when you’re building skill and endurance.
How can you tell whether the exercises suit your back?
Let your symptoms and movement quality guide you. Mild muscle effort is normal. Sharp pain, electric pain, or symptoms moving farther down the leg mean you should stop that version.
Notice how you feel during the move, soon afterward, and the next morning. A drill can feel fine at first but leave the area more sensitive later. If symptoms rise and remain raised, cut the range, effort, or number of reps. Drop the exercise if those changes don’t help.
In my experience, the best check is a normal task that often feels stiff, such as getting out of a chair or walking across the room. Test it before the routine, do a small dose, then try it again. Easier movement is a reason to keep the dose. Worse movement means it needs changing.
Low back pain isn’t one single condition. A move that settles one person’s pain may bother someone else with similar-looking symptoms. A physiotherapist, doctor, or qualified trainer can adjust the routine if symptoms keep coming back or limit sleep, work, and walking.
Which technique mistakes reduce the benefit?
The first mistake is using full force. You need just enough tension to hold your trunk steady, not a whole-body clench. Bracing too hard can make breathing tough and add more pressure than the task calls for.
Another mistake is adding movement through the lower back. People often lift too high in the curl-up, sag in the side plank, or arch during the bird dog. More movement doesn’t mean more benefit. The goal is a quiet lumbar area while other body parts move.
And don’t rush toward the hardest form. Your exercise choice should fit what you can do now. A knee side plank and a one-limb bird dog can teach the same skill with less load. Progress comes through control, not choosing the version that looks most advanced.
Don’t hold your breath for every rep. Keep your trunk firm while taking small, calm breaths. This teaches you to stay supported during real tasks, when you can’t stop breathing each time you lift or reach.
What do the Big 3 leave out?
The Big 3 are a starting tool, not a full back program. They develop trunk endurance, but they don’t cover walking capacity, hip strength, lifting skill, or the needs of your job and sport.
Once the movements feel steady, connect that control to daily life. Regular walking is often a simple way to get active again. Later exercises may include a hip hinge, squat pattern, loaded carry, or another task that suits your needs.
Here’s another missed point: a sore back doesn’t always need extra stretching. Hard toe touches or twisting the lumbar vertebrae can bother some backs. If guarding causes the stiffness, repeated stretching may keep the problem going. Gentle movement and a slow rise in useful activity may work better.
You don’t need to brace all day, either. Constant tension can make normal movement seem unsafe. Brace for each hold, relax between reps, and allow your body to move naturally outside the exercise.
When should the routine progress?
Progress once you can finish every rep with steady breathing, no loss of position, and no later rise in symptoms. Change just one thing at a time. That way, you can judge the result.
You might add a short hold, then add a rep in a later session. For the side plank, go from bent knees to straight legs. For the bird dog, reach farther before adding ankle or wrist load. For the curl-up, build better control instead of lifting higher.
The Big 3 have worked when they help you get back to tasks that matter. Repeating the same easy routine forever won’t prepare you for heavy lifting or long workdays. Your wider program should grow as your capacity comes back.
Actionable takeaway: Perform one careful round of the modified curl-up, bent-knee side plank, and bird dog today, using holds of no more than 10 seconds, then keep only the versions that leave your movement and symptoms the same or better.
Common questions
What is the number one exercise for lower back pain?
Walking is often a good first exercise for lower back pain because it is gentle and keeps your body moving. Start with short walks and stop if the pain gets worse or spreads down your leg.
Does the McGill Big 3 actually work?
The McGill Big 3 can help some people build core strength and reduce lower back pain. They work best when done with good form and as part of a plan that fits the cause of your pain.
What are some good exercises for L3, L4, and L5 back pain?
Gentle walking, bird dog, side plank, and a small curl-up may help pain around L3, L4, and L5. A doctor or therapist should guide you if you have leg weakness, numbness, or sharp pain.
Are the big 3 good for back pain?
Yes, the McGill Big 3 can be good for back pain because they strengthen the muscles that support your spine. They may not suit every injury, so stop if they increase your pain and ask a health professional for help.
